Can i get good marks in GATE through IES coaching?

Now iam in 3rd B.tech(eee).
And i want to become an IES officer,for that i want to go for good IES coaching centre,in Delhi.
At a time i also want to write Gate exam.should i get good marks in it by going IES coaching?
Iam also intrested to study my M.tech in IIT's.
Can i get that much....in gate....
Pls give me a clarification.

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