Hello; First is to not wait until the night before to study. A little each day and a month should be plenty.
Do you know which type of learner you happen to be? Visual, auditory or kinetic? Of course we are usually a combination of all three with one type being a bit more dominant. I am more kinetic than the others. I have found that if I see or hear something it sticks with me better if I write it down later. One example is notes taken or recorded during classes. I found it to be very beneficial if I later re-wrote my notes and /or transcribed a lecture.
I also would use a memory routine. When I went to bed I would try to recite in my head my notes as I lay quietly until falling asleep. I did this for the hardest classes most often, but some class each night. What else do you have to do in that time? Yeah I know, you likely thing of that girl.
May be best to not see the girl until after exams as well. I am sure she will understand. Maybe get one of your male friends to keep her company so she is not too lonely. You can explain how it is a sacrifice for the future well being.
Good luck
