Anywhere you normally can go, just.... be sneakier..
JHE is open (some way or another) 24/7, and as long as classroom doors are not locked, you've got a decent place to study. Libraries are open later during exam times (not midterm period I don't think). MUSC 24/7, usually pretty empty late late late at night during non-exam periods (well, empty of studiers, still people sleeping). IWC has some good space to work with and can't really be completely sealed even if it has a closing time. CVA has hosted some study space at some church during exam periods in the past. Lots of classrooms in the basement of MUSC (GH/KTH/CNH), most of which are empty and unlocked.
Basically be sneaky or find back doors.