Hello kaushik, yes,the time is sufficient for preparation for Gate 2021, if you are currently enrolled into any gate coaching, continue that, if not take a good online gate coaching but if you feel you can prepare on your own, then self study is the best. Make a good time table and dedicate those hours for your gate, check the cutoffs, be knowledged about the syllabus, exam time, pattern and previous years question paper. For any other information check https://engineering.careers360.com/exams/gate .

Hope this helps.

Thank you.