Hey Tamim,
Yes, an MCA student is eligible for the GATE exam.
However, in my opinion, if you are planning to join an M.Tech then it's not a good idea as you already have a post graduation degree in MCA.
If you want to join PhD in IITs or IISc, you have two options:
If you're interested for jobs, then too, your MCA degree will allow you to apply for most of the tech jobs.
Now the choice is yours to make, but do think wisely.
All the best :)
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