can I do study of jee from now
Yes u can study for jee mains now for January attempt if u haved filled form & if u didn't fillup jee form for January attempt then u can fill form for jee April attempt.
There are many crash courses going on YouTube channel, unacedmy, various offline Coaching institutes. U can watch and follow them. Many are unpaid courses for which u don't have to pay a single Rupees & many are paid too.
U can download 'doubtnut' app from playstore or u can follow 'vedantu jee' channel on YouTube. They are taking 45 days crash courses for free. But it all depends upon u, that if u are serious,displined or not. IN 45 DAYS U CAN STILL GET A NIT WITH GOOD BRANCH. BEST IF LUCK!! btw i am too an IIT-JEE 2020 aspirant.
Doubtnut :- https://doubtnut.app.link/yKAZJz9ZCY
VEDANTU JEE Channel :- https://www.youtube.com/playlist?list=PLCtUyOrCJbxw4xZx68lTh-4R0Ew3rJktA