About
Keystone Education offers English & Math Enrichment, Honors & AP Classes, SAT Test Preparation, and College Application Assistance. The program also provides College Counseling Programs for 7th–11th graders, One-on-One Private Tutoring, and Summer Programs.
• Ages: 5–18 years old
• Schedule: Spring semester classes available Monday–Friday in the afternoon and early evening, and on Saturday during the day
Keystone Education has been serving elementary, middle school, and high school students in the San Gabriel Valley since 1995. The program has helped many thousands of students achieve higher grades and gain admission to universities such as Harvard, MIT, Yale, Stanford, Berkeley, UCLA, USC, Johns Hopkins, and Princeton. All classrooms are equipped with interactive smart-board technology in an internet-enabled digital learning environment that includes a computer lab with more than 18 MS Windows–based computers with MS Office, internet access with parental controls, and printing services, across a 5,000+ square foot campus with 10 classrooms. Keystone Education partners with Keystone Educational Publishers, whose team consists of curriculum experts who create unique lesson plans and original standardized test content, including challenging original materials for writing, reading, mathematics, and grammar. Founder Diane Sartor has more than 30 years of mentoring students. The program’s mission states that today’s students are challenged to learn faster and absorb vast amounts of information, and that educators have a responsibility to guide students to embrace challenge, create reachable goals, and gain skills they need to succeed on their road to college and in life.
Last updated July 6, 2026.
• Ages: 5–18 years old
• Schedule: Spring semester classes available Monday–Friday in the afternoon and early evening, and on Saturday during the day
Keystone Education has been serving elementary, middle school, and high school students in the San Gabriel Valley since 1995. The program has helped many thousands of students achieve higher grades and gain admission to universities such as Harvard, MIT, Yale, Stanford, Berkeley, UCLA, USC, Johns Hopkins, and Princeton. All classrooms are equipped with interactive smart-board technology in an internet-enabled digital learning environment that includes a computer lab with more than 18 MS Windows–based computers with MS Office, internet access with parental controls, and printing services, across a 5,000+ square foot campus with 10 classrooms. Keystone Education partners with Keystone Educational Publishers, whose team consists of curriculum experts who create unique lesson plans and original standardized test content, including challenging original materials for writing, reading, mathematics, and grammar. Founder Diane Sartor has more than 30 years of mentoring students. The program’s mission states that today’s students are challenged to learn faster and absorb vast amounts of information, and that educators have a responsibility to guide students to embrace challenge, create reachable goals, and gain skills they need to succeed on their road to college and in life.
Last updated July 6, 2026.
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