I hope it will still be funny when I rank higher than you guys.
Pride cometh before the fall. Underestimate the complexity and difficulty of law school exams at your peril.
Also, I rarely used hornbooks or supplements, and never relied on them in lieu of going to class or reading the textbook. I never trusted them. I worked very hard, but I knew that the work I was doing related to the class as my professor taught it, not the subject as some other professor phrased and organized it. The one time I did rely on a supplement, in criminal law, I think it really hurt me, because I didn't learn the subject in the way that the professor taught it. Perhaps in other classes I might have been luckier, but I never tried it again.
Also, the guy with a 4.0 is either an extraordinary legal genius or full of sh!t. Getting a 4.0 in one's first semester is a rarity; the idea that it can be done without ever cracking a casebook or a supplement strains credibility.