As u mentioned that ur of is disturbing you so much that it is affecting your academic performance, I would suggest you see a psychiatrist

Hi OCD symptoms can be quite troubling for many people & could cause significant impact. It is important to determine the nature, severity & impact of your symptoms in the context of your personality & psychosocial issues to determine the appropriate treatment. Medicines help in severe cases. But generally using specific techniques of exposure & response prevention (CBT), relaxation & lifestyle modifications would help a lot. You will need to consult a psychiatrist to discuss above issues & get the appropriate treatment. Hope this helps. Best Wishes.

It won't be a good idea for you to treat or deal with your OCD by yourself . You should consult psychiatrist as OCD is significantly curable. Regarding your studies it will be helpful to seek for behavioural therapy.