Hi Chandan,
The National Aptitude Test in Architecture [NATA] is esentially for students who have passed 10+2 examination. You need to have a background of scoring a minimum of 50% in Physics, Chemistry, Math and an overall 50% in the qualufying examination. However, there is no upper-age limit for the exam, so you can go ahead with it, if you wish to. To know more about the exam and details related to it, read up on Careers 360 at the link given below
https://engineering.careers360.com/articles/nata
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