Hey

Here is a link containing the study material, video coaching, and free papers along with few tips on how to crack NATA Exam.

https://mosaicdesigns.in/information/preparation-tips/nata

For the reference of books, I would suggest that no single book will ensure your entrance as such and the most important thing crack this exam will be your presence of mind and your GK about the latest architecture going on around the world and your own locality.

here are some books that you can go through:

1.'NATA' - Satya Prakashan - Prof. S.C. Garg & Dr. Yogesh Garg.

2. A complete self-study guide for B.Arch. entrance examination' - Arihant publication - P.K.Mishra (2014/2015).

3. For PART-B you can choose aptitude test reference book of P.K.MISHRA

You can even go for youtube tutorials for better preparation.

All the best :)