Pls help me get my life back on track.

So let's keep this short I fucked up!. In May I shifted away from my home and took admission in a coaching which I regret now as it's not going on to well. I thought I would be able to adjust easily in hostel and all but I was wrong I frequently went home because of health reasons and took days off and my roommates were too retaded they were the buri sangat Now I have shifted in a good pg with good roommates But the point is I have wasted my 11th and have loads of backlog I can't remember things in studied in my initial days I am no longer dreaming of iit I just want a good a grade college. Pls tell me how should start now how should I complete my backlog shall I start from zero which I am thinking Shall I buy pw or some other platform for preparation I am not able to solve any sums in my class tests Pls help with tips like from where to study or how to study My attention span is very less sometimes I think it's adhd but I have still controlled my mobile screen time. Nowadays I just zone out and wrong and depressing thoughts sorround my mind. Pls help me TLDR: Wasted 11th pls advice how to continue from this moment.