Interior Design

Interior designing is a very good option. A lot of institutes are there which are providing this career option in India.
As you are very much particular about Kolkata,
there are many good colleges in Kolkata also. Few that I know are:
J.D Birla Institute,
Glamour School of Fashion and Interiors.
Many more are there. To know more, refer to the link that will provide you information collected by Shiksha:
https://www.shiksha.com/design/interior-design/colleges/colleges-kolkata

Hi Gunjan,
All the institutes offering a Masters program in interior designing generally have a common entrance test that assesses your quantitative aptitude, reasoning ability, English language and general knowledge. Thereafter, some institutes might conduct creative aptitude tests which generally includes drawing tests and portfolio. Since you are already pursuing a Diploma in interior designing, it should not be difficult for you to clear creative aptitude test.

Hi Shivam,
Well, you must check with universities directly. If your Bachelor's degree is from a recognised board and you meet admission requirements, you can of course. Write to some universities abroad and see, all have different admission requirements so you have to check all the requirements separately. After contacting them gradually, you will have an idea.

Hi Hinal,
It is great to see your interest in interior designing but unfortunately, learning only AutoCAD will not suffice to become a professional in the industry. The interior design courses are specially designed to equip you with certain skills like design principles, color therapy, space planning and industry standard software. It gives a thorough exposure to students on different kinds of projects to prepare them as a professional. It will also make you aware about various materials and products. Taking up an internship under a trained and successful interior designer is, of course, a cherry on the top.