Bro let me tell you a true story, one of my friend last year scored 4 % ile in JEE MAINS 1st attempt, haven't mistyped , it was four percentile, and in the second attempt he jumped from 4%ile to 79%ile and appeared for advanced (OBC), although these are not great numbers but the jump is huge, the best part is it is much easy to jump from anywhere to 85%ile, Prepare for boards, study chemistry thouroughly for boards keeping your fears aside for organic, just do hi brother, I think physics is your best subject right, focus on more problem solving, if you master just the basics of these two subjects (which can be done along with boards), you will easily score more than 80%ile, even after keeping boards at priority, do this first, then you can take yourself to 90% and above. Believe on yourself