Let me give you a tip i wish someone had given me back in the day...
..use your time in college 'free periods' to crack the books and do some work.
college isnt school, it is setup to define your capability to learn on your own.
turning up to lessons and paying attention (like in school) isnt enough.
get in the library, do your homework the day you get it (not the night or morning before) and appreciate the opportunity you have, trust me on the following, with every year that passes it is 100% harder to do because of a multitude of other 'life' issues.
do it now while you can, dont end up some [Poor language removed]-heap that pissed it all away.