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Jackson R-II School District
Jackson Sr. High

Jackson R-II School District

Jackson Sr. High

Jackson, Missouri

1,764 students

High School, Grades 9–12

(573)243-9513School Website

#63

Best ACT in Missouri High Schools

1,764

Students

17.1:1

S:T Ratio

School Snapshot
Key metrics at a glance
Avg ACT Score

22

B

out of 36
Average
AP Courses

17

A

courses offered
Excellent
AP Enrollment

14%

C

of students
Average
Student-Teacher Ratio

17:1

B

students per teacher
Average
This Week at Jackson Sr. High – August 19, 2026

231 students practicing on Varsity Tutors

SAT Prep

1

A

B

C

D

2

A

B

C

D

3

A

B

C

D

4

A

B

C

D

5

A

B

C

D

1520

0

students

Start practicing →
ACT Prep

36

ENG

MATH

READ

SCI

0

students

Start practicing →
Math

0

students

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English

0

students

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Science

0

students

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Explore practice resources for Jackson Sr. High students
Academic Grades

Select a grade level to explore courses and resources

9
Grade
10
Grade
11
Grade
12
Grade
Academic Resources

Typical courses and practice resources for students at Jackson Sr. High

Biology
9

Cell biology, genetics, evolution, and ecology

AP Biology
AP

College-level biology with lab component

Chemistry
9

Atomic structure, reactions, and stoichiometry

AP Chemistry
AP

College-level chemistry with lab component

Physics
9

Mechanics, waves, electricity, and magnetism

AP Physics 1
AP

Algebra-based mechanics and waves

Environmental Science
9

Ecosystems, human impact, and sustainability

AP Environmental Science
AP

College-level environmental science

World History
9

Global civilizations from ancient to modern times

AP World History
AP

College-level world history analysis

U.S. History
9

American history from colonization to present

AP U.S. History
AP

College-level American history

Standardized Test Dates

Upcoming national, state, and school calendar dates that affect students at Jackson Sr. High.

National Tests

August 1, 2026 – November 30, 2026

ISEE — Fall Testing Season

Testing window

August 3, 2026 – June 30, 2027

SSAT — Flex Testing

Testing window

August 22, 2026

SAT — National

Test date

August 28, 2026

SAT — National

Registration deadline

September 1, 2026

ACT — National

Late registration deadline

September 1, 2026

SAT — National

Late registration deadline
+76 more national tests this school year

State Assessments

September 14, 2026 – December 18, 2026

MAP-Alternate Assessment — MAP-A

Testing window
MO

February 1, 2027 – May 21, 2027

MAP-Alternate Assessment — MAP-A

Testing window
MO
See the full national test & school calendar
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School Details
Address

315 S Missouri, Jackson, MO 63755

Phone

(573)243-9513

Website

Visit Website

District

Jackson R-II School District

Teachers & Staff
Directory

Find contact info, departments, and classroom details

Academic Calendar
2026-27

Important dates, holidays, and school events

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Other Schools in District
West Lane Elementary
North Elementary
Gordonville Attendance Center
East Elementary
South Elementary
Russell Hawkins Jr. High