AP Calculus Links
Albert.io - Tons of practice problems categorized by topic
AP central - Info about the exam/some sample problems
Calculus.org - Wealth of resources for any level calculus student
Pre-Calculus Links
Math-bits - Everything in one place. Look under "For students" for some review lessons and useful graphing calculator help.
Geometry Links
Math IXL - Tons of practice problems categorized by topic
PARCC Practice Tests