Science

Yes, your marks are good enough to get admission here. You can try to get admission as you are eligible according to your marks. So, you may get admission.

Sorry to say, but B.tech in food technology requires physics, chemistry and maths subject from 10+2.
Infact, B.Sc in food tech also asks 50% or 55% aggregate in 10+2 with subjects physics, chemistry, maths and biology/home science.
There maybe some colleges offering diploma/graduate degree under B.Sc

First, you should qualify their entrance exam as entrance exam is mandatory to get admission in Annamalaai university. So, you should first apply for entrance exam first.

Yes, you can get a college for microbiology from NRI Quota.

Admission in VIT is possible only if you will give VITEEE exam unless you are an NRI.
I hope this helps.

Hi Vignesh, You can consider Shanmuga arts and Science Technology & Research academy as first, Annai velankanni, Bharath College of Science and Management, as further options.
All the best for your future.

Best Courses After 12th for Science Students with PCM, PCB and PCMB are mentioned at the link provided below:
https://www.shiksha.com/courses-after-12th/science.