courses to become a Fashion Designer

You can check it by clicking following link :-
https://www.shiksha.com/design/fashion-design/colleges/colleges-Surat.

No, you can apply after 12th in any fashion designing course.

In case you want to do a Diploma in fashion designing, then class 10th marks are fine. But, for a Bachelor degree, class 12th pass is a must. Either ways, I would recommend you to complete the class 12th and do Bachelors for a better transition in career. All the best.

About Gandhinagar Campus:
The NIFT Campus at Gandhinagar, considered to be perhaps the greenest city in India, was established in 1995 at a temporary campus building allotted by Government of Gujarat at Sector 26, Gandhinagar. Later, Government of Gujarat allotted a plot of 20,000 sq. Mt. Land for NIFT Gandhinagars permanent Campus near Info city, which became operational in February 2004. An additional 10,000 sq. Mt. Land was allotted for the Girls Hostel, Directors Bungalow and Staff Quarters.

Hi,
Some institutions for fashion courses are:
Satyam Fashion Institute, International College of Fashion, NIFT (in Bengaluru, in Mumbai and also in New Delhi). Some institutions for beauty courses are:
VLCC Institute, International Beauty Academy, Raunak Institute of Beauty, Health & Hair Design, etc. Best of luck.

You will have to appear for an entrance test conducted by NIFT to get into it.