Yes dear. NCERT is sufficient just not for your boards but also for upcoming competitives. You may underestimate the value of NCERT in your school days (I did the same mistake). But later you will know how holy it is.. To begin with…Soyou are in 12th. For maths trust me NCERT is more than enough, do it 4 to 5 times and you are going to score well, solve the examples also. For biology and chemistry(specially organic reactions ) same suggestions go with your NCERT. But for physics you need to practice from outside, I used to use Pradeep’s physics and class notes. For English same thing notes and test books. And here you gooo! ❤️📚