Diploma

Government Polytechnic college.

Talking of Mechanical Engineering:
Thanks to the reservation system, it depends on your caste. If you're from SC/ST, a rank of somewhere around 200 would be enough. If you belong to the OBC categories then a rank of around 100150 would do. Here comes the big one!
If you're from general category, you need to have a rank of around 25! Yes it's 25 only. Speaking of other branches, you can just take twice the ranks I mentioned. Visit for details: http://www.btechadmission.co.in/.

Yes, this can be good course if you have keen interest in Interior designing. The curriculum covers all the topics which include Principle of design, Landscape in Interiors, Design and Drafting, CAD based designing, Space design and etc. Interior designing career helps students to get into different industries like corporate, hotels, resorts, architectural firms, and etc. The following are the top Institutes offering the Advance Diploma course in Interior designing.
1. IIFA Multimedia Bangalore
2. J. D. Institute of Fashion Technology, (Delhi, Bangalore and Mumbai)
3, Inter National Institute of Fashion Design (Delhi).

The most of the Interior design courses offers after the completion of 12th class. So its better to complete yours 12th first for much better options.