Hello, I think depending only on NCERT books is not good choice but i didn't say that NCERT books are not good.You must read them but there must be concept clearity.Beacuse in exam there must be mostly questions on concept bases.Today there are many ways to study a subject except books.You can go through Online material or youtube tutorials.Main thing is you must be clear about paper i.e .what type of questions will be there.You must study previous year papers and join test series. These things matters to score good marks.Time management also required

Best of luck for your exam