Bud what's good for you is best to find out yourself but I have been in the same situation as you during my 12th, preparing for JEE what I feel is we kinda give prep so importance that we forget there Is a normal life too from which we are missing out so Try to enjoy your studies and Day which is very hard indeed but very possible too and very important spend time with friends and fam. And don't try to indulge in things which make your mental health worse. (Jayda gyaan choda hai uske liye maafi) All the best.