MOEMS Contest Problems, Volume 3 (Division E & M)
Math Olympiad Contest Problems, Volume 2 (REVISED)
Competition Math for Middle School
Becoming a Problem Solving Genius: A Handbook of Math Strategies
Prealgebra
The Art of Problem Solving, Vol. 1: The Basics
American Mathematics Competitions (AMC 8) Preparation (Volume 1)
Prealgebra Solutions Manual
The Moscow Puzzles: 359 Mathematical Recreations (Dover Recreational Math)