B.Tech

A B.Tech+MBA is definitely better than only a B.Tech however, most decent B-Schools in India have a classroom with 90% engineers and there is no special differentiation or advantage that you'll get.
There are some B-Schools like NITIE and also some specialisation like Operations and IT that are more

Yes, a B.Tech holder can apply for M.Sc in physics. Please use the link provided below to search for a college of your choice. Download their brochure which contains important details like eligibility, admission process, and important application dates.
https://www.shiksha.com/science/colleges/m-sc-p

Hello Rajan,
Certain seats are reserved for students from abroad for admission into IIT. I am attaching a link that I hope will help you.
http://www.iitb.ac.in/en/foreign-students-admission-to-iits

Hello Taha,
Yes, you have indeed very good academics. But I feel the best course for you is to approach specialised agency that is dealing with sending students to Germany. They would know different nuances so that you don't fall into any trap.
Best wishes

Hello Javed,
Unfortunately, rules of migration or about changing college or/and University are quite tough. Practically it's not possible.

Please refer to the link provided below for the list of colleges which offer courses in MBA (Agriculture).
https://www.shiksha.com/mba/colleges/mba-in-agri-business-colleges-india?utm_expid=8943562-14.L3jWz9aOTbmXh4VSK7g4dg.0&utm_referrer=https://www.google.co.in/

Hello Ankit,
With unemployment at almost 50% for the fresh engineering graduates, it very good idea that you have thought of. India's population is growing and hence insurance persons required is also increasing. Please approach any private or govt. insurance companies. They are always on the lookout