Hello NEET Aspirant!
yes NCERT books are always important for the foundation knowledge,apart from that you can go the past year question papers to the trend of questions asked and solve mcqs(multiple choice questions) regularly. Try to solve topic wise questions which will give you a in depth understanding of the subject.
for practice you can prefer the following books:
- NCERT fingertips ( for physics, chemistry and biology)
- objective physics,objective chemistry, objective biology (chapterwise questions) from Disha publications .
- previous year questions from arihant publications.
I think you find a website- MyPustak very useful. They provide second hand books free of cost. You can get all the NCERT textbook books, guide books, books for competitive entrance exams, etc.
MyPustak is a trustworthy website, where you will get used books for free and in good condition. You just have to order books online through the website and it will get delivered at your place within few working days.
I hope you find this answer useful.
all the best and study well.