Keystone Education

Keystone Education offers English and math enrichment, honors and AP classes, SAT test preparation, college application assistance, college counseling programs, one-on-one private tutoring, summer programs, and writing workshops. Its English enrichment includes weekly lessons in vocabulary, grammar, reading comprehension, writing, critical thinking, and good study habits. The writing workshops have students analyze fiction and non-fiction sources to develop creative and analytical writing skills.

Programs

• English & Math Enrichment — Elementary, middle school and high school students; 3rd to 8th grade for English Enrichment Program; 7th to 10th grade for Advanced English · Weekly lessons in vocabulary, grammar, reading comprehension, writing, critical thinking, and good study habits.
• Honors & AP Classes — Middle school and high school students · Includes honors and AP assistance courses, including honors writing, honors biology, AP European History, AP Language & Composition, AP Calculus AB, and AP Physics 1.
• SAT Test Preparation — Middle school and high school students · Preparation for the Digital SAT using tests and strategy lessons.
• College Application Assistance — Middle school and high school students
• College Counseling Programs — 7th-11th Graders
• One-on-One Private Tutoring
• Summer Programs
• Writing Workshops — Elementary, middle, and high school students · Students analyze fiction and non-fiction sources to develop creative and analytical writing skills.

At a glance

• Ages: 8–16 years old
• General schedule: Fall 2026 Schedule; Weekday Schedule; Weekend Schedule
• Facility hours: Monday: 2:00pm - 6:30pm; Tuesday: 2:00pm - 6:30pm; Wednesday: 2:00pm - 6:30pm; Thursday: 2:00pm - 6:30pm; Friday: 2:00pm - 6:30pm; Saturday 10:00am-3:00pm; Closed on Sunday

About the provider

Keystone Education is led by founder Diane Sartor. It has served the San Gabriel Valley since 1995, with over 20 years of experience and more than 30 years of mentoring students. The program says it has helped many thousands of students achieve higher grades and gain admission to universities including Harvard, MIT, Yale, Stanford, Berkeley, UCLA, USC, Johns Hopkins, and Princeton.

Last updated October 8, 2026.