The Physics Classroom - A set of instructional pages written in an easy-to-understand language and complemented by graphics and Check Your Understanding sections. An ideal starting location for those grasping for understanding or searching for answers. Interactive, practice tests and questions, simulations and more. Great starting spot for reviewing.
Phyiscs Central - General site with everything physics presented by the American Physical Society
MCAS Questions - Review old MCAS questions and earch by topic for review materials.
Khan Academy Chemistry - Review tutorials from Khan Academy
Chemistry Zone - Presented by Science Joy Wagon - many free tuorials and activities. Student password available from instructors.
Chemtutor - General site to review topics and concepts