I was a dropper as well. So I can understand your situation. Judging your schedule, you do have a lot of time to do productive work. And you have to make each second count. The coaching is just there to aid you and make you feel aware of the competition with mock tests and all. But believe me, its the self study that matters the most.
Topics like Rotational Dynamics, AOD, Limits Continuity Differentiability and even Ionic Equilibrium are very important topics.
In Physics the more the concepts are clear the better you will be able to solve the problems. So focus on mastering the theories first, refer to HC Verma and DC Pandey for that.
For maths, just solve questions, doesnt matter which book, start from level 1 to higher problems. If you are not able to solve level 1, then once again go through theory, its perfectly normal to start something again especially if you are willing to work hard.
For chemistry, never underestimate NCERT. Its the key.
And for all three, remember to do previous year questions.
Now, how will you find time? Well, you have a lot of time. Just keep a check on your sleeping cycle and distractions like movies and you know what all. Keep your sleep within 6 and a half to 7, but not too less. That gives you 17 hours, consider coaching and all its homework and exams as additional 7-8 hours(should be more than enough). You still have approx 10 hours. Remove another 2 hours for the usual activities. You now have 8 hours. You must manage to get 8 hours of study time. And you have to be committed and dedicated and focused. Its not easy, its hard and thats why it is so hard to clear such an exam. But it is this quality that differentiates winners from losers in such a competitive exam like JEE. Just some motivational words...