Serving 710 students in grades 9-12, Robert M Grable Jr Mount Sinai High School ranks in the top 5% of all schools in New York for overall test scores (math proficiency is top 10%, and reading proficiency is top 10%).
The percentage of students achieving proficiency in math is 80-84% (which is higher than the New York state average of 52%). The percentage of students achieving proficiency in reading/language arts is ≥95% (which is higher than the New York state average of 49%).
The student-teacher ratio of 11:1 is equal to the New York state level of 11:1.
Minority enrollment is 26% of the student body (majority Hispanic), which is lower than the New York state average of 61% (majority Hispanic).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 710 students
- Student-Teacher Ratio: 11:1
- Minority Enrollment: 26%
- Graduation Rate: 96% (Top 10% in NY)
- Overall Testing Rank: Top 5%
- Math Proficiency: 80-84% (Top 10%)
- Reading Proficiency: ≥95% (Top 1%)
- Science Proficiency: 96% (Top 5%)
- Source: National Center for Education Statistics (NCES), NY Dept. of Education
Top Rankings
Robert M Grable Jr Mount Sinai High School ranks among the top 20% of public schools in New York for:
Category
Attribute
Overall Rank
Math Proficiency
Reading/Language Arts Proficiency
Science Proficiency
Graduation Rate
School Overview
Robert M Grable Jr Mount Sinai High School's student population of 710 students has declined by 6% over five school years.
The teacher population of 65 teachers has grown by 6% over five school years.
Grades Offered
Grades 9-12
(Supplemental Virtual)
(Supplemental Virtual)
Total Students
710 students
Total Classroom Teachers
65 teachers
School Calendar
School Rankings
Robert M Grable Jr Mount Sinai High School ranks within the top 5% of all 4,346 schools in New York (based off of combined math and reading proficiency testing data).
The diversity score of Robert M Grable Jr Mount Sinai High School is 0.43, which is less than the diversity score at state average of 0.73. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#118 out of 4346 schools
(Top 5%)
(Top 5%)
Math Test Scores (% Proficient)
80-84%
52%
Reading/Language Arts Test Scores (% Proficient)
≥95%
49%
Science Test Scores (% Proficient)
96%
78%
Student-Teacher Ratio
11:1
11:1
American Indian
n/a
1%
Asian
9%
10%
Hispanic
14%
31%
Black
1%
15%
White
74%
39%
Hawaiian
n/a
n/a
Two or more races
2%
4%
All Ethnic Groups
Graduation Rate
96%
87%
Participates in the National School Lunch Program (NSLP)
Yes
Eligible for Free Lunch
12%
55%
Eligible for Reduced Lunch
1%
3%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), NY Dept. of Education
Frequently Asked Questions
What is Robert M Grable Jr Mount Sinai High School's ranking?
Robert M Grable Jr Mount Sinai High School is ranked #118 out of 4,346 schools, which ranks it among the top 5% of public schools in New York.
What schools are Robert M Grable Jr Mount Sinai High School often compared to?
Robert M Grable Jr Mount Sinai High Schoolis often viewed alongside schools like Miller Place High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
80-84% of students have achieved math proficiency (compared to the 52% NY state average), while ≥95% of students have achieved reading proficiency (compared to the 49% NY state average).
What is the graduation rate of Robert M Grable Jr Mount Sinai High School?
The graduation rate of Robert M Grable Jr Mount Sinai High School is 96%, which is higher than the New York state average of 87%.
How many students attend Robert M Grable Jr Mount Sinai High School?
710 students attend Robert M Grable Jr Mount Sinai High School.
What is the racial composition of the student body?
74% of Robert M Grable Jr Mount Sinai High School students are White, 14% of students are Hispanic, 9% of students are Asian, 2% of students are Two or more races, and 1% of students are Black.
What is the student-teacher ratio of Robert M Grable Jr Mount Sinai High School?
Robert M Grable Jr Mount Sinai High School has a student ration of 11:1, which is equal to the New York state average of 11:1.
What grades does Robert M Grable Jr Mount Sinai High School offer ?
Robert M Grable Jr Mount Sinai High School offers enrollment in grades 9-12 (Supplemental Virtual).
What school district is Robert M Grable Jr Mount Sinai High School part of?
Robert M Grable Jr Mount Sinai High School is part of Mount Sinai Union Free School District.
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