If the class you want has room for &ls;n' students, you will be the &ls;n+1' to apply. Class schedules are designed so that every student will waste the maximum time between classes. When you are occasionally able to schedule 2 classes in a row, they will be at opposite ends of the campus. A prerequisite for a desired course will be offered only during the semester following the desired course. The one course you must take to graduate will not be offered your last semester. If you're confident after you've finished an exam, it's because you don't know enough to know better.