Hey! If you need someone good with concepts in subject like database, compiler, theory of computation, Computer Networks, Digital Logics, Data Structures, C programming, Algorithms then I think I can help you with this.
Not only concept I will teach you how to use them in solving numerical questions.
I have Qualified GATE exam twice(2019( with 91 percentile) and 2020 (with 96.2 percentile)).
It's conducted by IIT so you can understand the standard of that exam. It basically test the your knowledge in core subjects of computer science plus engineering mathematics and Aptitude.