Math 1-2-3, Inc., Manhattan

A former math teacher, actuary, and holder of a dual degree in mathematics and economics from Vanderbilt University, Math 1-2-3, Inc. founder Mark Kronenberg has been helping students hone their number crunching abilities since 1995. Before hiring each member of his tutoring team, Kronenberg ensures that they have a math degree, at least five years' post-college tutoring experience, and lightning-fast mental math abilities, never missing a beat when answering tricky student questions or tipping a waiter who only put in 16.5% worth of extra effort. Their seminars prepare students with varied skill levels for the math on standardized tests, and the team’s private home tutoring sessions harness the power of arithmetical house calls to help students do better in all levels of math, including algebra, geometry, statistics, and calculus.