Hi Tanvi,

National Aptitude Test in Architecture (NATA) is a national level UG exam that is being conducted by Council of Architecture (COA) for admission of studnets to 5-year B.Arch and B.Planning programmes.

You can give this exams if you have passed 10+2 level or equivalent from a recognised board or you should  have passed 10+3 Diploma Examination with Mathematics as compulsory subject to be eligible for this exam.

Yes, you can give this exam during your 12th Standard and you are not required to get into any other college for giving NATA Exam.

Refer here for more info - https://engineering.careers360.com/articles/nata-eligibility-criteria

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!