hi,

see both of the exam is conducts for m.tech or post graduate courses , however gate exam is widely accepted in top tier 1 m.tech colleges like IITS, nits, iiest, iisc bangalore. however you must go through the syllabus  and make your strategies. gate questions papers is quite tougher than pgcet or any other post graduate courses examination. you must follow the previous years papers and work on your weak areas. there is many online videos, lecture series , test series available which is really helpful to secure a good score.

last thing is you must practice a lot to make time management for each subjects in examination hall.

follow our article to know more about gate 2021, https://engineering.careers360.com/articles/gate