Engineering

Yes, you can appear for JEE Mains but check that your eligibility criteria, as if you have passed your class 12 in 2015, then you are not eligible for that, class 12 LC will be accepted in JEE counselling.

For B.Sc in VNIT, Nagpur, you have to appear for JEE Mains. Then, after it's counselling, you would be able to get the college.

The best college for fashion design is NIFT Delhi. It's fees would be approximately 1 Lacs per annum.

For that, you can opt an easy way. After class 12, NEST exam is conducted by main 3 research institutes and if you scored great in that, then you would be eligible to get admission in 5 year integrated B.Sc. M.Sc. Programme and after that, you would be directly posted to Homi Baba Research Center.

A candidate who has passed any undergraduate degree examination with 50 % aggregate marks and 50% of marks in the cognate subject (Mathematics) from any recognised University in India or abroad recognised by UGC / AIU are eligible to apply.

Yes, you are eligible because the marks need to qualify for the advance is 100. So, you are.
Regards.

Yes, but it will depend upon the cut-off. According to some experts, the cut off this year is expected to be 98. So, you will qualify if that meets.
Regards.

If you had given Mains, then surely you are interested in engineering and in those marks, you can also get some good colleges or you can look up for advance.
Regards.

Depends totally on your interest. You can either opt for M.Tech or MBA. If you are interested in Engineering and want to go deep in that field then go for Masters but if you want to explore the industry and the business then MBA is your destination.

Ya, you can, but your rank should be under 800-1100.
All the best.