Dear Roy
Yes,  you can do that. It's better to do of in the same field you opted for in BTECH. And also in order to do that you need to to take either GATE or the entrance exam for your state engineering colleges.
Now,  it's been almost 2 years,  my idea is you can join in Any Gate training institute like a short term course if you have less time and it's enough to crack The State examinations too.  For more doubts,  comment here
All the best.

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