For school and college students

How things work
The site has good content explaining how things work. The blog links, quizzes, pictures make it more interesting…
Mathgoodies
Online math tutorials, games, puzzles, worksheets for 9 to 13 year olds.
Statistics
A good site to learn concepts of statistics from the net…
Education in Physics and Mathematics
For enchanting exposure to physics and mathematics
Khan Academy
Excellent learning resource in mathematics and physics in form short video lectures
Scientifix American
Ask the experts at Scientific American. Good site where interesting science questions are answered by experts.
Veritas Prep
Concepts and resources in mathematics for preparation of examinations.