Resources:
www.khanacademy.org (general with video tutorials)
https://translate.google.com/ (for foreign language classes)
http://www.studygs.net/index.htm
http://www.shmoop.com/learning-guides/
https://quizlet.com/
http://www.how-to-study.com
www.ck12.org
http://mathforum.org/dr.math/
http://www.60secondrecap.com/ (language arts)
http://www.chemteam.info/ChemTeamIndex.html (Chemistry)