Hello Ritu

Regarding which subject pdfs you want to know , kindly mention it .

As from your profile I found that you beling to Andhra pradesh and you are an engineering aspirant .

I can give you information about JEE Main pdf download , you will cover all topics in these books

NCERT 11 th book download

NCERT class 12 maths book download

Chemistry class 11, part 1 and part 2

NCERT class 12, chemistry  part 1and part 2.

NCERT class 11 and class 12 physycs books

for more information you may visit the link given below

https://engineering.careers360.com/articles/ncert-books-for-jee-main