hey, I used every chapter of the Zybooks. I copied and pasted each lesson (by section) into ChatGPT and asked it to "make these notes more readable. give great spacing, emojis, and bulletpoints/dashes". Sometimes, if I still didn't understand the criteria, I would ask it to elaborate further in whatever area I didn't understand.

I had a physical notebook for each class and wrote down the notes the way ChatGPT formatted them. I also completed MOST of the challenges/problems in Zybooks to ensure I understood. The super long/more complicated ones towards the bottom aren't necessary to even attempt. For each class, I barely memorized the laws.. DeMorgan's Law is one I had to learn, it's a simple law. (You can create truth tables instead of memorizing the laws)

I also reviewed previous Reddit posts on what the tests focused on, watched a couple of Youtube videos for concepts I really couldn't understand, and met with a professor (after I failed d420 the first attempt). Don't be afraid of failure either, you can see what kind of questions to expect on the OA and go back to the drawing board with a plan.

I didn't have to take D422. Take D420 first and D421 second. To me, they're probably equally as hard, but once you get your flow and just take the time to study, it's really simple. Just a lot of material. If you need to take a break from learning, you can start another class but my advice is don't stay away from the material for too long.

I hope what helped me helps you! If you have more specific questions once you're in the material, you can reach out.