Design

You may take provisional admission for B. Design in Interior, but if your compartment exam does not clear you will not be able to continue it.

There are some colleges of fashion design in Delhi
check this link below :
https://www.shiksha.com/design/fashion-design/colleges/colleges-Delhi-ncr.

Application start date was 22nd March and end date is not yet declared. For further updates and notifications, keep a check on college-website I.e. http://www.psgcas.ac.in/admissions_process.html.

Annual center fees + GST as applicable, will be Rs 45,000/-
Annual corporate fee + GST as applicable, will be Rs 17,000/-
For more details please check here- http://www.nifd.net/campus/

You can get in touch with the college authorities to know the class schedule on the numbers provided in the link: http://vista360.in/contact.php

The best for interiors would be B. Des, as B.Sc will give you knowledge of Science. Except basic maths, no part of Science is needed for Interiors. So, it's better to go with B. Des. This will help you get trained with your hand drawings, sketching and lines, which is in fact very useful in interior

Lal Bahadur Shastri Training Institute, Pacific University, Udaipur, Aligarh Muslim University, Aligarh etc.

Yes, admissions are based on entrance exam.
Refer this link for more information.
https://www.shiksha.com/design/fashion-design/course/diploma-in-apparel-manufacture-and-design-premlila-vithaldas-polytechnic-pvp-mumbai-santacruz-west-92761

Yes, you can do this course after 12th if you are interested in this course.