Hi Anjali,

The NATA examination consist of two parts in which Part A includes Mathematics and General Aptitude. General aptitute also consist of General Awareness of national/international Architects and famous artichtural creations. It can be prepared with reading current affairs only. The books will help you in preparation are listed below:

• A Complete Self Study Guide by Arihant Publications
• Self Study Guide by NATA360
• Study Guide for B.Arch and NATA Entrance Examination with solved papers by GKP 
• NATA and B.Arch Question Bank by Ar. Shadan Usmani
• Steps to NATA and JEE Mains Entrance Exam Guide by R Gupta

You can also solve previous year question papers and mock tests. 

All the best!!