Hello Padhamavathi,

NATA stands for National Aptitude Test for Architecture, which is a national level exam for admission into colleges with B.Arch and B.Planning courses. 

NATA has 3 parts, maths, general aptitude and drawing. 

Drawing though might not seem like it but is very important for not only the exam but also future studies. 

I would suggest working on your mathematics and practising aptitude questions for at least 4 hours a day. The drawing has to be improved too. It should be engineering in type and not artistic. There are several aspects to the drawing that has to be worked upon. Please refer to the following link for more details on NATA - https://engineering.careers360.com/exams/nata

Personally, I would like to suggest you something else also. Please try to give the JEE MAINS paper 2 also. This is the exam that can help you get into some NITs.

Hope this helps and Good Luck!