Managing time is a key factor to succeed in any examination. Now as you have this much of backlog it would be hard for you to cover up everything but its not impossible. Except from your college hours you have to find out time in the morning or at night. Now I know you will be tired after college, so its preferred that you try to pull up study sessions before your college starts. At first find out how many videos are pending corresponding to each topic. Now at first do the classes topicwise and on completion of a topic, start solving the books. As you have backlog, you can't do all the problems at this moment. So try to solve the most important ones and see if you can solve them. Also try to use your Sundays and Saturdays in the best way. If you can maintain a rigorous schedule then its expected that you will be able to match the pace with the classes.

For JEE MAINS preparation tips consider the link below:

https://engineering.careers360.com/articles/jee-main-preparation-tips

I hope this helps. Wish you a great eve!