• College Admissions Advice From Students Who Have Overcome the Odds

• SuperMemo Wiki on Learning (the best resource on learning I've seen)

• Cognito Mentoring Wiki

• Learning Wiki

• Favorite Explorable Explanations: Seeing Theory (introduction to probability and statistics), everything Nicky Case has created

• Personal favorite Khan Academy courses: Hour of Code, Computers and the Internet, Computer Science, the entirety of Economics, many History videos

Reading recommendations for high schoolers:

• Standard reading recommendations to improve your SAT / ACT verbal scores

• Wikipedia

• Paul Graham's essays: paulgraham.com/articles

• Brian Tomasik's essays: briantomasik.com/writings

• SPARC Book Recommendations. But really, just read anything!