Your roomates are NOT your friends. It's a working relationship and it's best if you are already not best friends to treat each other with respect and a little distance. Striking up a friendship or expecting someone to be your friend AND live with them doesn't always work. Just respect each other and keep the dialog going.
Get under the bed storage
If you can, find on the wall storage (if they allow it). I got a trunk that acted like a table and stored stuff.
Expect to keep only your seasonal clothes there and switch them out at home.
get a bathrobe
if you have coin op washer/dryer, get a few rolls of quarters
my second year, we got a loft. It really freed up the room.
the container store has some really cool ideas
You have to be aggressive in each and every class. They are not your babysitters. And take it easy your first semester, don't overload the coursework. Find your rhythm.

Average, for horses with some experience at this level