If possible, get out and walk for a bit each day, at least 30 minutes. Go to a cheap movie.
IIRC you had to leave last time because of grades after an auto accident. Review your notes from that last semester as a refresher. Do it somewhere other than your apartment (library, McDonald's, Starbucke, etc.) Check out some books from the library on study skills, learning styles, etc. Make a plan for your time if you know what your schedule will be. Practice that schedule. When school starts you'll be in the routine. Start going to bed at a reasonable hour.
Do some prep work. Make sure as much laundry is done as possible. Clean the apartment from top to bottom and straighten it up. A clean environment helps the mind focus. Make some meals and freeze them. If you can't do that, make some menu plans so that you have maybe 10 meals you don't have to think about, but can just pick the fixings up at the store rather than walk around for 30 minutes in a daze at the store (been there, done that). Don't forget good food like fresh fruits and popcorn.
These things will fill your time while getting you ahead of the game.
