How do i get myself away from thinking about girls?

look i am in a situation where i have to make my career my studies are very important because my enterance exams a re just 10 months from now.. i have been working hard since previous year, but this year i got Tubercolosis and i wasted 5 months as sometimes it was back pain or sometime it was joints pain .. now i am taking medicine and there are no more pains but i am not able to concentrate... my mind is getting diverted .. i used to love a girl when i was in class 6 but never ever told her.. i saw her facebook account and i was like mad... i send her a message rather everyday motivated her to get onto her deams .. but i got a bad reply... i deleted my account ...but i can't overcome thinking about her..I WANT MY PREVIOUS LIFE BACK ...HOW SHOULD I KEEP MY MIND IN STUDIES JUST FOR 9 MONTHS,,,PLEASE HELP..