Hello Aspirant ,

You have a lot of resourses for  you in you mobile.

One of the best website for learning gate is

GATEOverflow

Geeks for geeks

newgradience

techtud

I suggest you to go through the websites.

Youtube vedios are not exactly clarify and not fully explaomed.

These website gives you a lot of Stuff.

I hope this information will help for you.

THANK YOU.