Hi all I have a BS and a masters in physics, both attained in very good Brazilian universities. Now I'm in the US for my PhD, and from all the difficulties I thought I would encounter, I find myself struggling with something completely unexpected: exams. This is how exams work in the universities I attended; you're given a very difficult set of problems and up to four hours to solve it. If you were well prepared you could solve most of it, if not you do what you can. Time is not really an issue. Here I'm given an extremely trivial set of problems and 45 minutes to solve everything. I did 3 exams so far and I couldn't finish a single one of them in time! Anyway, I'm open for suggestions and tips as I need to learn how to solve these exams faster. I consider myself a good student, I work very hard, my homeworks all get 100% score, but these exams are killing me. It's not just a matter of getting a lower than ideal grade, I think I'm going to fail these classes.