I use stronger language when I feel more confident. I gave the advice that rang true for my conditions, I suppose if you have a shitty professor or you don't have any understanding of the law then you should refer to a hornbook as a "side-arm".
Nobody does that though, and hence I suspect they waste their time poring through 300 pages of material they will never be tested on, if they are tested on it - it will be in the class notes using the language and perspective of the person grading the damn answer
Even if I come up short on grades, I think that my last-minute outlining and lack of practice testing would be the cause-in-fact of those shortcomings. It was never my "knowledge" of answers that was the problem. Every question I hit I had enough information from my notes to write for twice the time limit, it was always the more practical restraints of time & word limits and my inexperience in rationing those limitations that cost me
The law isn't that confusing, only the current state of the Erie Doctrine (after Shady Grove earlier this year) and the state of personal jurisdiction (after Asahi) really left me scratching my head about where the law stood. It's no coincidence these were both plurality decisions in the Supreme Court that didn't resolve any of the meaty issues.
1) A supplement is not meant to be pored over independent of what you are covering in class. The only class I used an outside supplement for was Con Law, and I did not read Cherminsky front to back. What I did do was look up the section or the cases we were covering for the next week in class in our syllabus, and then read those pages first before reading our casebook.
2) You say the law isn't confusing, but trying learning con law from a shitty (at least for beginners) casebook. The casebook covered the background of sovereign immunity in like 4 sentences, and spent only a few words on Alden v. Maine, Seminole Tribe, etc. Guess what? Our professor expected us to understand everything about this background and how they all interconnect in the next class period.
3) Different things work for different people, esp taking the different structure of classes and different professors into account.
You are coming across as way too cocky, seeing as you have zero grades in.