Often the sequence of topics will be deeply significant once you are up to speed. Also for really hard work, knowing someone that knows the material is going to grade your homework is (at least for me) extremely motivating to do my best to master the material. Also office hours- periodically I get stuck trying to prove false things due to careless reading, and the professors are quite good at backing up and asking why I am trying to prove something they know to be false.
As with many human activities it is startlingly easy to fool oneself and so things involving a more experienced person can help. Grading, code reviews, peer review, certifications, etc.