hi,

see you are eligible to appear in gate exam i.e graduate aptitude test in engineering from any of the stream of engineering you have complete or currently studying. Candidates are eligible to appear in gate irrespective of their bachelors of engineering course. gate score is valid for three years, so in case you qualified gate exam on 2022, you may take admission based on this gate score in 2022, 2023 and 2024 year for m.tech or relevant courses.

Go through the below link to know in details about gate exam papers:

https://gate.iitb.ac.in/papers.php