Hi arun,
You don't need to worry about branch option in PG. You can do PG in any course but for that you have to prove you are capable of doing pg in that course.
For example if u are interested in coding/cse then you can give GATE CSE. Get a good rank in GATE CSE and you are applicable for M.TECH CSE from IITs/IISc/NITs/IIITs. So, Anyone can give exam in whichever stream he is interested in GATE. There have been many people who have done this and excelled. In fact, there was a person from Mechanical engineering who next appeared in GATE CS and secured AIR 1 in GATE 2015.
I hope this will help!!
all the best for the future!!
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