You can find a detailed list of the recommended books in the link below:

https://medicine.careers360.com/articles/best-books-for-neet

The best books are NCERT textbooks for all 3 subjects. They are the most important books as many questions are asked from them. Definitely buy them and start using them now. You can supplement your learning with additional reference which are mentioned in the link above. Go to a bookshop and look at the textbooks and see which ones you find more simple and interesting for you and then only buy it. 

You can even consider purchasing a good coaching institute's study package inclusive of all subjects or for a specific subject (such as Aaskash or Allen's study packages). They provide relevant information on important topics succinctly. The details are in the link below:

https://dlp.allen.ac.in/study-material/study-material-premedical.asp

https://www.aakash.ac.in/medical-engineering-foundations-distance-courses

Good Luck!