B.Arch

Hello Nandhakrishnan,
The required subjects in 10+2 is English and Mathematics only. So, you are eligible to do B.Arch provided you have cleared +2 with minimum of 50%.
You should also appear for entrance exams like NATA, JEE main paper 2 etc. to secure admission into the good colleges for B.Arch.
All the best.

Please refer to the link mentioned below for a list of top colleges offering courses in B.Arch:
https://www.shiksha.com/architecture-planning/colleges/b-arch-colleges-india

Eligibility for B.Arch. Candidates should have minimum score of 40% in National Aptitude Test in Architecture (NATA) I.e. at least 80/200, for consideration of admission into first year B.Arch.

Yes you can get admission by giving NATA entrance exam.

Bachelor of Architecture (B.Arch) is a well-known undergraduate Bachelor's degree program of Architecture. Architecture is the art of planning, designing, and constructing buildings and other physical structures. You can become an Architect after completing B.Arch education.
The study of B.Planning deals with ultimate planning techniques. The working areas include metropolitan cities as well as small congested towns, cities and also villages. For the country like India, future scope is getting better.

The cut-off is minimum marks a student is expected to score in order to pursue B.Arch.
Candidates are expected to have 40% or more marks to qualify in the NATA exam. They have to obtain at least 80 marks out of 200.
There are many NITs where you can get admission into with 4034 AIR. Please check online for the cut-offs of NITs.

For information regarding TANATA exam and its consequences, please refer to the link mentioned below:
https://www.shiksha.com/architecture-planning/exams/tanata

You may opt for B.Tech CSE or any equivalent studies in computer science like BCA based on your interest. If you have any queries kindly revert it.
All the best for your future.