Hi Chirag,

GATE is a national level examination which gets you into Post Graduation( M.Tech) in top IITs and NITs and other famous colleges across the country. 

On the other hand, PGCET is a state level examination which is valid only across the state.

So, if a college within the state accepts any of the exams scores, you can apply for the college with whichever score you are good in. 

So, if you got a good score in GATE, you can apply with that score and if you got a good score in PGCET then you can go with it.

Hope this helps.

All the best...!!!