He doesn't cover all the topics.
Many topics like permutations and combinations,probability,generation functions,recurrence relations,composition of functions etc are not covered.
You may refer his videos for other topics but for remaining topics you have to follow other resources.
Some resources for missing topics are:
- Book by kenneth rosen
- video lectures by kiran kumar sir (channel name=gatebook)
- video lectures on trev tutor channel
The main point is that discrete maths require a lot of practise to master (in general, every subject requires this).So focus on solving quality questions too.
HITESH KAUSHIK
