Hi. I agree, studying day and night and not sleeping enough can really obstacle you instead of help. You need also to sleep!
Also anxiety can be part of the problem. You could talk to a psychologist about your school anxiety. Maybe there are some at your college. Or try some relaxation techniques.
All these exams near are surely hard, but if you study in advance, with a good organization and without too much anxiety, you can do it. You could reflect on your study method and improve it if necessary.
I know how it is to feel overwhelmed for school But please, do just your best. And try not to worry too much. Your well being is the most important thing.
Lots of hugs