Hello,even I'm a GATE aspirant for Mtech

If depends on which branch you are from.

GATE syllabus for CSE will be from the .btec subjects of CSE

however Aptitude and verbal ability will be common for every branch.

So ,the subjects include

Operating systems

Compiler design

Computer Networks

DSA and C programming

Discrete mathematics

Formal languages and automata theory

Engineering mathematics

And few more

So if you are good at these subject deslide studying Msc. Then you ll get a good seat in Mtech CSE through GATE

Crack your exam well, All the Best !

Hope this helped you!:)

Thank you 

Regards,.

Sirisha Sanatha