See there are no soft copies available for the question papers of NATA available officially or unofficially on Internet. So if you wish to get the NATA previous papers then follow the books by Arihant or Pearson.

Some of the books which are really helpful for the NATA are provided below:

• Quantitative Aptitude by R.S. Agarwal
• Mathematical Problems by Books by V Govorov, P.Dybov, N.Miroshin and S.Smirnova
• A Modern Approach to Verbal & Non-Verbal Reasoning by R.S. Agarwal
• Higher algebra by Hall and Knight
• Higher algebra by Bernard and J. M. Child
• Problems in Calculus of one variable by I. A. Maron
• NATA & B.Arch Question Bank by Ar. Shadan Usmani
• A Complete Self Study Guide for B.Arch by P. K. Mishra

For NATA preparation tips visit the link below:

https://engineering.careers360.com/articles/how-prepare-for-nata

I hope this answer helps. All the very best for your future endeavors!