Here is a list of useful websites for college going students 🙂
1) www.ted.com : Short Fascinating videos and illustrations on all topics under the sky
2) http://ocw.mit.edu/index.htm: study materials, lecture notes, videos etc free of cost from MIT university on almost all topics
3) https://www.quora.com/ : the most entertaining and informative website, where you can learn something new daily
4) http://nptel.iitm.ac.in/ : Indian version of mit open courseware, where you will find an exhaustive collection of video lectures on all major topics taken by IIT professors!
5) http://www.factmonster.com/ : The name says it all
6) http://www.ipl.org/ : online reference service that offers everything from free dictionaries and encyclopedias to books, magazines and newspapers.
7) http://www.sciencedirect.com/ : for online journals