National Institute of Design, Ahmedabad

Yes, you can prepare for both simultaneously. As without sketching, the entrance will be difficult to clear.

NID offers multiple UG and PG courses. You have not indicated for which course are you seeking information. You may refer to following link for all information on Admission process at NID: http://admissions.nid.edu/

NID has a 4-year Bachelor of Design program wherein the first year is foundation while the following years are spent in specialising in a field of your choice (out of 8 disciplines), the syllabus thereby varies greatly. NID also offers a Master's degree programme in Design for a period of 2 years offering a range of other disciplines, each with a different syllabus.
The fee structure for both can be accessed via this link attached below: http://www.nid.edu/admissions/fees.html

It's difficult to give an affirmative yes or no answer to such a question. Animation at NID , is a vigorous course requiring consistency, determination, hard work and rigour throughout. The faculty is one of the best, with alot of experience in the industry. They are amazing guides and mentors as well, and the creativity around you does inspire one to push the boundaries and do something incredible.

Architecture and Design, although appear to be similar, require different skill sets and abilities from their students. Design requires more innovative thinking and creativity while architecture requires similar traits, a higher level of technical knowledge and skills of sciences is a required. So I would suggest that you figure out where your interests lie and accordingly find colleges suited for you.

Hi,
You can go for:
Pearl Academy, Delhi (NCR West Campus)| Delhi/NCR
Vogue Institute of Fashion Technology| Bangalore
Amity School of Fashion Technology, Amity University|
Symbiosis Institute of Design| Pune
J. D. Birla Institute| Kolkata

You can appear for the entrance exam. I would suggest you to apply for M.Des in National Institute of Fashion Technology. NIFT-Delhi, Mumbai and Kannur provide M.Des.

You can go for RFS Academy of Design.