NATA 2017, the National Aptitude Test is an entrance test for those candidates who are planning to take up admission to the 1st year of 5-year Bachelor of Architecture course at all institutes/schools/colleges of Architecture in India. Council of Architecture (COA) is the exam conducting authority for NATA. Qualifying candidates of NATA 2017 will be offered admissions to 5-year B.Arch programme in Government-aided, Private Unaided universities and Deemed Universities.

To check in detail you can refer below article

http://www.engineering.careers360.com/articles/nata

Good Luck!!