Hello,
I think you are not getting time for your self study.But you have to make a timetable for self study.You should follow a timetable of your choice.Even if you get 2-3 hours time for self study that will be enough.I hope your basic concepts are clear from ncert books.You can solve HC Verma,OP Tondon,RD Sharma,Arihant,etc books now and practice as much as you can.You should take guidance from your teachers and seniors.Give mock tests and solve previous years questions after solving books.Analyse yourself after each attempt of mock test.Give time to strengthen your weak areas.
Remember quantity of time for preparation doesn't matter but in that much quantity what you have studied does matters a lot!!
Good luck.

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