A social networking site not used for evil.  No selfies, or dating help here, more of a place to research colleges and universities.  There is a section dediacted to helping you work through tough problems.  No free rides though.

You aren't underlassmen anymore.  If you haven't spent some time looking yet, it's time.  Use this as a guide to help you narrow down your search.

An online tutorial site which will help you in pretty much any class you are enrolled in  A great place to come if you are struggling with a concept.