Interior Design

Since you are a commerce graduate, then why are you again applying for graduation in totally different field, else go for MBA or M.Com. The point is why you don't go for Masters now as you have already completed your graduation. All the best.

Please visit this shiksha.com link on B.Sc in interior designing:
https://www.shiksha.com/design/interior-design/colleges/b-sc-colleges-delhi-ncr

The cost of one year diploma in interior designing is about 65000.
Hope this helps you.
Be free to share any problem you have.
All the best for your bright future!

For this course, you have to pay around 1200 rupees for the application form for the entrance exam of interior design that is non-refundable in any case.

If you choose any good college like graffiti institute of fashion technology, Indore, they will teach you basic drawing & observation skills in 1st year. So, there is no need to worry. Drawing skills can be acquired by right technique under good teachers and hard work by constant practice.

It's a very good choice! The placements are really nice and you need not to worry about anything. Just take admission in that.