I need your help. Days numbered.

I have almost 20 days in hand for practice before JEE Main. Please suggest me all the important chapters subject-wise (PCM) segregated into Class 11 and 12 which I must grind to get a good rank in JEE Main. Chapters which have high weightage and are relatively rewarding. I'm definitely not aiming for IITs. I will settle on IIEST (atleast mech). I need to revise the 11th chaps. 12th chaps are almost good. Just need thorough practice in both. Will be doing PYQs from marks. Should that be enough? I know some people will laugh at me but I believe with hardwork, I will do it! Any other advise welcomed, no abuse please. I'm confident I'll find a fellow ISCian ready to help me.