Every prof I had in university trotted out this same issue. They all tried to take down answer sheets as soon as possible, got upset when people asked with help

Every prof I had in university trotted out this same issue. They all tried to take down answer sheets as soon as possible, got upset when people asked with help solve them past questions, etc. Except one. This guy had been teaching for like 10 years, and put EVERY SINGLE PAST PAPER HE HAD out there. He provided students with a massive, massive stash of questions and answers. For any given problem, you could either solve it, or you could just navigate thousands of PDFs trying to find the solution. And when you wanted to do some solo practice, you had endless options. He reused questions from those papers in midterms, but the chances of you actually picking the right question from all the possibilities was very slim. It's one of those situations where, paradoxically, by being completely gregarious, he achieved better results than by being ultra guarded and secretive.