D422 Discrete Math: Algorithms and Cryptography

Let me just say, this class is HORRIBLE. For the first 2 discrete math classes, I was intimidated at first (which was especially scary since math has always been my favorite and best subject) but was able to do just fine going through the ZyBooks, actually scoring my first exemplary on the second course. I expected to go through similar motions with D422, but it could not be further from the other 2. The ZyBooks are actually so bad, nothing like the other classes. Barely any demonstrations or step-by-step practice problems. You get a convoluted description and then are expected to know the answers 90% of the time. The material in this course feels way off the other courses.

What did you guys do to supplement your learning in this course?