Private School Review - Established 2003
ISI Academy
A+ World Academy

California Private High Schools Belonging to Middle States Association Commissions on Elementary and Secondary Schools (MSA-CESS)

For the 2026-27 school year, there are 3 private high schools belonging to Middle States Association Commissions on Elementary and Secondary Schools (MSA-CESS) serving 104 students in California. You can also find more schools membership associations in California.
The top ranked private high school belonging to Middle States Association Commissions on Elementary and Secondary School (MSA-CESS) in California is ISI Academy.
The average acceptance rate is 92%, which is higher than the California private high school average acceptance rate of 81%.

Quick Facts (26-27)

  • # Private Schools: 3

Quick Facts (26-27)

  • # Private Schools: 3

Top Ranked Private High Schools Belonging to Middle States Association Commissions on Elementary and Secondary Schools (MSA-CESS) in California (2026-27)

ISI Academy Photo
ISI Academy
Gr: 5-12 | 40 students
Avg. class size: 7 students
Sports: 13 | Extracurriculars: 16
Specialized Curriculum
255 Olympic Valley Road
Olympic Valley, CA 96146
(530) 583-8665
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A+ World Academy Photo
A+ World Academy
Gr: 11-12 | 60 students
Avg. class size: 12 students
Sports: 5 | Extracurriculars: 8
International (Swiss and Norwegian Headquarters).
San Diego, CA 03007
(407) 766-6369
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Map of California University Preparatory School
California University Preparatory School
Gr: 7-12 | 4 students
Avg. class size: 10 students
Extracurriculars: 8
18760 Colima Rd
Rowland Heights, CA 91748
(626) 964-9588
(15)
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Frequently Asked Questions

What are the top ranked private high schools belonging to Middle States Association Commissions on Elementary and Secondary Schools (MSA-CESS) in California?
The top ranked private high schools belonging to Middle States Association Commissions on Elementary and Secondary Schools (MSA-CESS) in California is ISI Academy.
How many private high schools belonging to Middle States Association Commissions on Elementary and Secondary Schools (MSA-CESS) are located in California?
3 private high schools belonging to Middle States Association Commissions on Elementary and Secondary Schools (MSA-CESS) are located in California.
3
Private Schools
104
Students
$48,100
Avg. Tuition
27%
Students of Color
7:1
Student-Teacher Ratio

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