i am studying 3rd b.tech(mech) i will wish to take gate coaching in 3-2 holidays.if i take it, is benificial yo me or not

in this time you can get some practice on mock test it would be some beneficial , you can get an idea of GATE exam

Of course coaching of any sort can be beneficial. www.onestopgate.com will be useful for your preparations. Postal and class room coaching assistance is available from Brilliant Tutorials. GATE forum, Elite Academy, Vani Institute etc.