Jee and NATA exam you can give after 12 th
With pcm and mathematics as the main subject in your 12 th respectively.
Through this you will get admission in btech and b.arch. respectively.
Btech : IIT NIT IIIT and other government college provide this .
But  GATE is entrance for higher degree which you can give after completion of your undergration.
Through this you will get admission in NIT ; IIT and other colleges for higher studies ( M.TECH.)
hope you get your answer.
Any other query welcome.
Good luck.

All three aremost important exams as Jeemain is accepted across all NITs /IIITs /GFTIs and most of private engineering colleges for Btech and B. Arch courses.

GATE is accepted for All Mtech courses at IIT and NIT and other private engineering colleges. 

NATA is for Architecture /B. Arch ciurses acceptedacross private architecture and some govt architecture colleges. 

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