Design

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 interiors. All the best.

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.

Please visit this site first
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Hi Suraiya,
If you wish to pursue Fashion designing from NIFT, either you have to drop to appear for the NIFT exam but that is not a good option. The best option is complete your Bachelor's from here and after doing your Bachelor's you can pursue your Masters from NIFT by giving the entrance exam for the same.
Good luck.

You can refer yo https://www.shiksha.com/design/nift-entrance-exam.