Hello Jagadeesh,

Please do not think that you are poor just think that you are talented and brave enough to face any kind of problem.

Remember one thing if you are talented enough then you don't need any coaching for preparation.  There are many online educational apps you can download and learn from there freely.Unacademy is one of the platforms where you can get some awesome courses for GATE and there is many more platform you can get on the internet. And you can question set for practice.

And now we will talk what to study:-

Just you need to revise your B.TECH notes and solve the problems from online portals.