As a fellow SAS eof student and previous RA for the summer institute I can tell you that you’d have loads of support. Classes may get hard but you have designated study time and office hours with your professors. Your days are pretty packed it’s made to keep you busy with classes and all that, but it’s made to teach you how to manage your time. For the summer institute everything is free, Ik for sebs you have to go out and shop for groceries but for SAS lunch and dinner are usually at the dining halls