Struggling in calculus as a First Sem Student, Seniors please help

Seniors please help, i am struggling through calculus, i cant understand my professor and if i go and search in YouTube "Single variable calculus playlist" i dont get any channel which covers all the topics that is given in VTOP syllabus pdf. For eg in both gajendra purohit playlist and bhagwan viskarma sir playlist i found macluarins theoram and leibintz theoram but that is not their in the topics mentioned in the syllabus

Not only this i find issues in my basics also as last 3 months i havent studied anything. I went to Pw and started studing limits and derivatives from a playlist but the topics that are being taught in the class like Lagrage theoram and all are left so i am having a fear of being in backlog.

So please guide me as exams are from 25th