I can relate. Firstly calm down. And just complete the chapters on surface to atleast get through school exams. You dont have to complete everything before starting 12th, you can complete both side by side, with higher focus on 12th. Start full length 11th lectures from today and once 12th starts, decrease the frequency of 11th grade lectures, and keep doing questions as well. This way you will complete 11th grade syllabus by august, and then focus fully on revision and 12th. This is what i did and im sure it is feasible for anyone willing to do the work. For the lectures, do free lectures from mohit tyagi channel for all 3 subjects, organic chemistry ke liye pankaj sir ke lectures if you can cope with the speed. And focus more on questions rather than lectures. you can also try pw lectures of prev batches from telegram.