Hello aspirant

Since you have already completed the BS IISER course , you will be able to complete the project work within one year and graduate with MS . If you will freshly apply for m tech , it will take two more years. It will not also be so beneficial.

You can apply for an external final project while still being a student of IISER.

still if you want to do m tech from IIT there are exit options after fourth year but you should complete since it is BS- MS integrated.

Hello,

Yes, you are eligible for the same if it is of 4 years duration. To know more about the Gate eligibility criteria, you can go through the below article :-

https://engineering.careers360.com/articles/gate-eligibility-criteria

Hope this helps you.

Good luck!