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Award-Winning 12th Grade AP Computer Science Tutors

Certified Tutor
10+ years
Aaron
I'm not tutoring or buried in my textbooks, you will either find me rock climbing at the Triangle Rock Club, playing Ultimate Frisbee, working on my car, or enjoying the great outdoors (beaches, mountains, forests--you name it, I love it). On rainy weekends I enjoy tinkering with computers and old e...
The University of Texas at Dallas
Bachelors, Mechanical Engineering
Duke University
Current Grad Student, Mechanical Engineering

Certified Tutor
6+ years
Mimi
I am an interdisciplinary educator with an Ed.M. from the Harvard Graduate School of Education and a B.A. from Dartmouth College. My background is primarily in integrated arts learning and museum education and I specialize in visual arts, history and art history, and object-based learning. In all su...
Harvard University
Masters in Education, Education
Dartmouth College
B.A.
Certified Tutor
10+ years
Nina
I am a recent graduate from a masters program in biostatistics at Columbia University. I received my Bachelor of Arts in biological sciences, with a focus in neurobiology at Northwestern University. In August, I will be starting a doctoral program in biostatistics at NYU. I was a teaching assistant ...
Columbia University
Masters in biostatistics
Northwestern University
Bachelor of Arts in biological sciences (focus in neurobiology)
Columbia University in the City of New York
Current Grad Student, Biostatistics
Certified Tutor
I am a graduate of Wesleyan University, where I received my Bachelor of Arts in Sociology with High Honors. With eight years of experience working in education, I've tutored students in math, science, history, and English, as well as helped students prepare for standardized tests. I've guided adults...
Harvard University
PHD, Education
Wesleyan University
Bachelor in Arts, Sociology
Certified Tutor
Liz
I am a graduate of Washington University in St Louis, where I received my Bachelor of Arts in History with minors in Humanities and Anthropology. Since graduation, I have worked as a tutor, teacher, and director of tutors at a charter public middle school in Boston. During this time I also received ...
Simmons College
Masters, Special Education: Mild to Moderate Disabilities 5-12
Washington University in St. Louis
Bachelor of Arts in History (minors in Humanities and Anthropology)
Certified Tutor
10+ years
Clara
I am tutoring I tend to ask my students to try to "teach" me concepts they are struggling with, or walk me through a problem that is challenging them, so that any conceptual mistakes or assumptions they are making become clear. In addition, I am a firm believer in never providing the answer to a spe...
Stanford University
Bachelors, Psychology
Certified Tutor
8+ years
Solange
I'm Solange - a recent graduate from Harvard where I studied Sociology & Women's Studies. I've been tutoring for eight years now, and have worked with a wide range of ages and in a wide range of subjects. Some of my specialties are college prep/test taking II worked in the admissions office on campu...
Harvard University
Bachelor in Arts (Sociology & Women's Studies)
Certified Tutor
Charles
I am a junior Mechanical Engineering major at Yale, and I hope to become a Naval Aviator after college. I am also a varsity sailor, and enjoy playing music with friends when I can get some free time. I have been tutoring my fellow students throughout my entire academic career, and I would best descr...
Yale University
Bachelor of Science, Mechanical Engineering
Certified Tutor
Christopher
I am a rising sophomore at Harvard College and am about to declare as a Mechanical Engineering concentrator, working towards a Bachelor of Science degree. I've always enjoyed sharing my knowledge with my peers and those around me and have done so in both formal and informal settings. I've been a tut...
Harvard College
Bachelor of Science, Mechanical Engineering
Certified Tutor
Michelle
I am proud to be a part of Varsity Tutors! I am originally from San Antonio, TX; I completed my undergraduate education at Rice University in Houston where I received a bachelor's degree in Biochemistry and Cell Biology. Currently, I am in my second year of medical school at Baylor College of Medici...
Baylor College of Medicine
Current Grad Student, M.D.
Rice University
Bachelor's in Biochemistry and Cell Biology
Top 20 Technology and Coding Subjects
Meet Varsity Tutors Experts
Connect with highly-rated educators ready to help you succeed.
Justin
AP Calculus BC Tutor • +48 Subjects
I am an aspiring applied mathematician, with particular interest in image processing and climate science. I graduated in May 2017 from Washington University in St. Louis with a bachelor's in physics and mathematics, and am beginning a PhD program in September 2017 at the University of Chicago in Computational and Applied Mathematics. I've tutored introductory physics students for three years and enjoyed it thoroughly, as a chance to help other students while revisiting fundamental concepts to enhance my own knowledge. I'm eager to continue reaching out and helping students of math and physics to succeed and, furthermore, to appreciate the beauty and power of these subjects.
Isabella
Pre-Algebra Tutor • +27 Subjects
I am a graduate of MIT. I received my Bachelor of Science in Mathematics with minors in Management Science and Ancient and Medieval Studies. Since graduation, I have started my PhD at Georgia Tech in Operations Research. Throughout my career I have TA'd several math and computer science courses at the college level. I have also taught at summer programs for gifted middle school and high school students. I am passionate about tutoring kids in math and science because I think that a strong foundation in STEM at an early age can set the tone for their future. In my spare time I like to engage in athletics, and was a Division 1 rower in college. Hobbies: reading, swimming, writing, books, music, running, art
Henry
Calculus Tutor • +41 Subjects
I'm eager to help you in your education. I'm a recent graduate of Harvard College looking to apply to law school. My senior thesis was written on John Dewey's ideas of education, which I deeply believe has incredible power to transform individuals and society.
Asta
Pre-Algebra Tutor • +74 Subjects
I am a graduate of the University of Chicago where I received my undergraduate degree in political science. Right after graduation, I worked as an academic and test prep tutor as well as admissions consultant in Hong Kong. For the past two years, I worked with a number of students to help prepare them for college in the United States.
Sabira
Middle School Math Tutor • +35 Subjects
I am currently attending Johns Hopkins University, pursuing a dual degree in Computer Science and Applied Math and Statistics. I love helping students and I love the feeling I get knowing that I was able to use my knowledge to make someone else happier. My favorite subject to teach is math because there are so many ways to learn it and if one way does not help I can use another. I used to teach taekwondo and interacted with all kinds of students, and I'm excited to help out more! Hobbies: books, reading, music, writing, art
Daniel
Pre-Algebra Tutor • +26 Subjects
I am excited to be home and help fellow straphangers on their educational paths! My largest wealth of tutoring experience is in foreign languages--particularly French--but I also feel very comfortable editing essays of any kind and working through standardized test concepts. My availability is extremely flexible, and anywhere in New York City works for me. I look forward to working with you.
Justin
Calculus Tutor • +38 Subjects
I am a graduate of the University of Chicago where I received my Bachelor of Arts in Philosophy. Currently, I am in the master's program at the University of New Mexico where I am continuing my education in philosophy. Ultimately, I hope to go on to earn a PhD in Philosophy so that I can continue engaging in my passions for learning and teaching. While in school, I have spent countless hours coaching high school speech and debate both in person and working online with students across the country. My focus in coaching has been to emphasize philosophy and critical thought to prepare students to think through novel arguments on their own. I am passionate about teaching and tutoring because I love seeing students learn to be intellectually independent and think through problems on their own terms by developing their critical thinking skills. I have devoted my life to education because I am passionate about it, and I try to share some of my passion for learning with the students I work with. I tutor all sorts of Standardized Tests, and I particularly enjoy working on logic-based problems like analogies and math sections. When I am not tutoring or reading for school, I enjoy strategy games (both board games and video games), listening to music, hiking, playing basketball, and just relaxing with friends.
Ingrid
Pre-Algebra Tutor • +51 Subjects
I am exploring my creativity by pursuing a double major in Asian Languages and Cultures with a focus in Korean, studying abroad in South Korea as a Benjamin A. Gilman Scholar, leading workshops that teach 3D printing and CAD for undergraduate students as the president of 3D4E, advocating for the first-generation and low-income student community as the Outreach Chair of the Quest+ Scholars Network, and getting involved with the Society of Women Engineers' outreach committee. I currently hold a work-study position as an administrative clerical aide in the Institute of Sustainability and Energy at Northwestern and was an undergraduate researcher in the John Rogers Lab. As I look forward with aspirations of applying to graduate school, areas of research in biomedical engineering and biotechnology that I am particularly interested in include biomaterials, pharmaceuticals, and drug delivery systems. Outside of the classroom, I enjoy learning on my own and sharing my experience and knowledge with my peers and other students. I hope to make use of my experiences with academics and learning in high school and so far in my undergraduate career in order to effectively tutor students who may be experiencing the same struggles in learning that I also experienced.
James
AP Calculus AB Tutor • +41 Subjects
I am currently a senior at Harvard College where I study chemistry, and I'll be attending Columbia Medical School next year. I have years of experience tutoring college students in math (mostly calculus) and chemistry including both general and organic chemistry. In addition, I am very familiar with all sections of the SAT and ACT having prepared several high school students for these tests. I believe that every student is capable of boosting his or her baseline score on these tests, so long as he or she works hard to get to know the format of the tests and the most popular types of questions. I tutor because I love seeing students develop a genuine passion for the subjects they once disliked (such as math and science), once they understand the power of these subjects and their applications to the real world.
Andrew
Pre-Algebra Tutor • +26 Subjects
I am comfortable tutoring math subjects up to multivariable calculus and differential equations, as well as college physics. Hobbies: books, music, art, reading, writing
Top 20 Subjects
Frequently Asked Questions
Students most frequently struggle with object-oriented programming concepts—particularly inheritance, polymorphism, and encapsulation—since they require thinking about code structure abstractly. Array and ArrayList manipulation also trips up many students, especially when working with 2D arrays or nested loops. Additionally, the free-response section challenges students who understand individual concepts but struggle to synthesize them into complete, well-designed programs. String manipulation and recursive thinking round out the common pain points, as these require both conceptual understanding and careful implementation.
Free-response questions require students to write complete, functional code under time pressure—something that's very different from multiple-choice. A tutor can help you develop a systematic approach: reading the prompt carefully, identifying required classes and methods, planning your logic before coding, and leaving time to test your solution. Tutors can also teach you how to write code that's clear and efficient enough to earn full credit, and how to handle partial credit by writing code that at least partially solves the problem even if it's not perfect. Practice with past FRQs under timed conditions is essential, and a tutor can provide targeted feedback on your specific coding habits and help you avoid common mistakes like off-by-one errors or forgetting to initialize variables.
The exam gives you 3 hours for 40 multiple-choice questions and 4 free-response questions. Most students should spend roughly 1.5 hours on the multiple-choice section (about 2-3 minutes per question) and 1.5 hours on free-response (roughly 20-25 minutes per question, leaving buffer time). The key is not to get stuck: if a multiple-choice question is taking too long, mark it and move on. For free-response, spend the first few minutes understanding what's being asked before you start coding—rushing into code without a plan usually costs more time than it saves. A tutor can help you practice this pacing with full-length practice exams so you develop a rhythm that works for you.
OOP mastery requires moving beyond memorizing definitions to actually designing and writing classes. Start by understanding the "why" behind each concept: inheritance reduces code duplication, polymorphism allows flexible code design, and encapsulation protects data integrity. Then practice by writing your own classes from scratch—not just reading code—and refactoring code to use OOP principles. A tutor can help you recognize when to use inheritance versus composition, understand how method overriding works in practice, and design class hierarchies that make sense. Working through progressively complex projects (like creating a game with multiple character types or a data management system) helps these abstract concepts click in ways that isolated practice problems can't.
Algorithm efficiency matters, but not as much as correctness. The exam focuses more on whether your code works and is well-designed than on whether it's optimized for Big O notation—that's more of an AP Computer Science Principles topic. That said, you should understand basic efficiency concepts: why nested loops can be slow, why ArrayList operations differ from array operations, and when to choose appropriate data structures. The exam does occasionally ask you to trace through code or identify which approach is more efficient, so understanding efficiency helps you write better code and answer those questions. A tutor can help you balance writing correct, clear code first while developing an intuition for when efficiency matters.
Debugging is critical because even small errors—a missing semicolon, an off-by-one loop error, or a logic mistake—will cause your code to fail. You should practice reading error messages carefully and understanding what they're telling you, tracing through your code by hand to find where logic breaks down, and using print statements strategically to see what values your variables actually hold. The exam doesn't let you use an IDE debugger, so you need to be comfortable debugging with your eyes and brain. A tutor can teach you systematic debugging approaches: start by isolating which part of your code is broken, check your assumptions about what variables contain, and verify your logic step-by-step. Regular practice with buggy code snippets helps you develop the pattern recognition to spot errors quickly.
Practice tests should mirror exam conditions: take them timed, without notes or IDE help, and in one sitting if possible. After you finish, don't just check answers—analyze every question you missed or found tricky, even the ones you got right by luck. For multiple-choice, understand why the correct answer is right and why you were tempted by wrong answers. For free-response, compare your code to the official solution and identify gaps in your approach or coding style. A tutor can help you identify patterns in your mistakes (Do you always struggle with certain topics? Do you run out of time? Do you misread questions?) and create a targeted study plan. Taking 3-4 full practice tests spaced throughout your preparation is ideal, with focused review of weak areas between tests.
Recursion is notoriously tricky because it requires thinking about a problem in a fundamentally different way than students typically learn. The key is starting with very simple base cases and building up: understand how a recursive method for calculating factorial works before moving to string manipulation or array traversal. Many students benefit from drawing out the call stack or tracing through recursion step-by-step on paper before writing code. A tutor can help you develop the mental model of "what does this method do to one element, and how does it combine results?" rather than trying to follow every recursive call. Practice with increasingly complex recursive problems—searching arrays, building strings, tree traversal—helps recursion shift from confusing to intuitive.
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