About Rambo Tutoring

Rambo Tutoring is a small in-home tutoring agency, run by Charles Rambo. It was founded in North San Diego County in 2010, and this website was created in June 2011.

We work with the students’ own class material at their own pace. This method allows us to quickly find—and fill—holes in students’ understanding. We adjust our tutoring style to students’ needs by watching how students work problems.

Our teaching philosophy is simple. Students need to spend time learning their subject, and they need to work-out their own homework problems. The tutor’s job is to explain the material, do examples, and find holes in students’ understanding. Mastery of a subject takes time and hard work. Gimmicks don’t work. We help students by creating focus which helps them use their study time efficiently and by finding errors in students’ work which helps stop bad habits from forming.

About Charles

Charles started tutoring at Palomar College in 2006, while he was a student there. He worked in Palomar’s “math center,” and tutored a wide variety of math topics, ranging from basic math to differential equations.

He left Palomar College in 2007 to study mathematics at the University of California Berkeley, where he received his bachelor’s degree in 2009. In 2019, Charles enrolled in UCLA’s master’s of financial engineering program and graduated in 2020.

From 2009 until 2019, Charles was a full-time private in-home tutor and author. His recent tutoring work has been one-on-one. He started Rambo Tutoring in 2010. Charles is currently the only employee. He passed the CSET mathematics subtest I & II, and the Society of Actuaries’ exams probability and financial mathematics exams.

Charles has written three books. His first book, GRE Mathematics Subject Test Solutions: Exams GR1268, GR0568, and GR9768 is a solution manual to three publicly available the GRE math subject tests. His second book, A Romp Tour of Trigonometry, was heavily inspired by his tutoring work. His most recent book, Practice for the GRE Math Subject Test, was inspired by the success of his first book and the need for additional GRE math subject test study material.