Hello,
The main work you have to do is study and get the concepts or basics of every chapters. For those NCERT will be enough for you. Then if you go for numericals there are many books which has lots of questions. You can go for OP TONDON book. It has lots of questions.  You can solve it and make a enough practice to to make your concepts strong and memorable. To test how is your performance and where you can improve yourself. You can give mock tests. After every evaluation you can increase where you are weak.
This process is lengthy yet fruitful. Every day you have to give 18 hours minimum. Jee main and advance both are tough exams but you can clear it with a dedicated hard work. So yes you have to work hard.
Hope it helps!

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