Follow past 28 years papers
If you want to have some good NEET e-books then
1.Install Pedagogy app
2.Create an account
3.At the bottom middle portion of the home page you will get a scan option
4.Click on that scan option
5.Then use code VILPEDA2020(it's not a referral code, it's an offer from the app till 31st July)
6.Then redeem the code(you can use the code till 1st June after that the code will expire)
7.You will get 43 e-books specially for NEET from Trueman,MTG,Willey,Arihant,Disha,etc.
8.You will also get daily dpps, mock tests for free
9.Many unacademy students and teachers like Pranav Pundarik use this app
and if you ask about its effectiveness then I used the app and practised over 78000+ questions and cracked NTSE,JEE(January attempt with 98.8 percentile),KVPY etc.
Hope it works for you and the code will be effective for everyone.

First of clear differentiation,integration and vectors. this should be clear then.. solve prblms related chapters...