PYQs enough for CS?

I was thinking of doing sumita arora back questions, but idts I will get enough time to do all of em.

I just did PYQs from swati chawla, covering a good amount of qns. What else should I do from the book that is helpful?

Theory esp is my weak point, I CANNOT ratta everything, how many marks is theory (define, diff etc) usually? 3? 4?