Hello Shubham

Attempting GATE in 3rd year will help you to know about the exam paper may be you will able or not able to attempt some questions but don't worry after giving GATE you will know more about the exam temperament. You can boost your self-confidence level and do well in the Graduate Aptitude Test in Engineering 2023.

Your GATE scorecard will be valid for 3 years. There are various PSU open for recruiting mechanical engineering candidate.

For more information you can visit this

https://www.google.com/amp/s/engineering.careers360.com/exams/gate/amp

For GATE 2022 syllabus

https://www.google.com/amp/s/engineering.careers360.com/articles/gate-syllabus-for-mechanical-engineering/amp

Best of luck

Cheers!!