My differenciation and intrigation part are weak so how can make it strong plz help me

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For the basics practise from RD SHARMA class 12....... There are many solved and unsolved questions for each and every profile of integration...for differentiation also it is good..... Once you get thorough with the different profiles and type of questions you can practise further from calculus by thomas pearson..... Or from other books as you prefer.....but what is really necessary is have good hold on the formula.....