For gate you have to 1st premer all your core subject.
It's is your own risk because you spend mony.
After all both are good.
The name of lecturer are Vishvadeep sir.Satish Yadav sir,
You can also buy a suggestion books
Digital Logic and Number representation by Morris Mano

Theory of Computer Science: Automata, Languages and Computation by Mishra K.L.P.

GATE Practice Sets by Pearson

Software Engineering: A Practitioners Approach by Pressman

You can visit the syllabus make a routine
GATE syllabus .
There are many youtube channel also for suggestion.
Practice previous years papers GATE question papers
Know more about gate exam pattern GATE exam pattern
For gate exam you can also visit theGATE 2022
For preparation theirGATE 2022 preparation .

For more information you can visit here
https://engineering.careers360.com/articles/gate-syllabus

I hope this answer helps you. Thank you , all the best.

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