Hello,

B.Tech is not that much required and it is not a matter  but you need to maintain a minimum of 65% aggregate or above. Some of the colleges require a minimum aggregate of 60% in B.Tech to give admission to the students. You can write GATE and get a good score in it and if you maintain 60% aggregate CGPA then you can get a seat in good colleges for M.Tech. For IIT's you require 60% aggregate in your B.Tech to get admssion for M.Tech.

Hope this helps you.