My office hours, and generally those of the faculty in the math department, are drop-in. That means that you can show up and expect me to be there during my posted office hours (plus or minus five minutes if I’m running a little bit late). You don’t need to schedule an appointment to see me; I usually operate on a first-come, first-served basis. I try to keep the waiting short by limiting an office hours visit to 5-10 minutes if there’s a long line, which means you might not get all of your questions answered at once.
For math exams in general, it can be useful to form a study group to talk over problems and solutions before the exams. It’s also useful to retry problems you’ve seen on homeworks, quizzes, and writing assignments (without looking at your previous attempt or the graders’ comments) to figure out what you need to focus on studying. For specific tips about studying for Linear Algebra exams, read on!