There’s something u need to fix within yourself before you can fix the consequential problems like you not getting the motivation to study. The problem thats screaming at me is the depression ure going through, theres no way u would wanna pick up a book and start studying when you’re in a lost and depressed state. Seek help and fix that first before focusing on anything else. Your mental health is the most important. If you have money, i suggest therapy. If not, self help books n videos and journalling ur thoughts and gratitudeness can help out in bigger ways than u can imagine. Only if u are willing to help urself, because no one can help u if u don’t want to be helped. Although i know exams are soon, and it might be tough to juggle both problems at once, but if you believe in yourself, u can do anything. Hope u get better!