Hello there! 

Greetings! 

You need not to worry,  there are many pcmb student who clear neet and score well in maths as well. I have personally seen a student who had scored 93 marks in maths in 12th board and 608 marks in neet as well. 

So , you should relax , scoring 90+ marks in neet is not that difficult,  to score 90+ marks  you need to focus on ncert and you should be able to solve each and every question of ncert including questions of miscellaneous excercises as well and then you should go for chapterwise past year papers of maths by arihant. Calculus has 44 marks. Out of which 19 marks are allotted to chapters 7 and 8 (Integration and its application). Normally 12-13 marks are allotted to chapter 7. You should definitely expect three 4-mark questions in this topic. In most cases, you’ll find two 4-mark question from Indefinite integration and one 4-mark question from Definite integral. So complete these topics thoroughly from ncert.

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Thankyou