Hi Supriya,
First you have to register for courses and there’s no guarantee to it because there will be rush (first-cum-first serve). Unless we know which courses you are planning to take, it’s difficult to suggest any books. Also, few Professors will suggest no books for their course. It depends.
If I were in your situation, I would relax now, enjoy these days at home, and bother only in July-August after I have registered for the courses, because it’s going to be very hectic in the college