There is your issue. Unless a man is paying my bills and committed to me for life, I will not allow him to ruin my peace of mind. You need to do the same. YOu let him get to you and put yourself in a position to get hurt. Take some responsibility for what is happening…makes it much easier to figure out a solution because now you dont feel so helpless.
BAD idea. Is he taking your exams for you? Will he be there if you flunk? Will he be supportive of you? So far, the answer seems like a NO.
Nomi, she is a girl. 
Education cannot wait. Youth will not wait either…but I will say this. The decisions you make in your youth will impact your life forever. If you let anything happen to your grades because of this dude…5 years from now you will be hitting yourself on the head and regretting. But what good is regret? Not much because you wont be able to fix anything by then. It will be too late.
YOu will still be able to pick up where you left off with this guy 2 years or even 4 years from now. But not your schooling.