Email the department offering the course to see what the best strategy is for trying to get into the course. Departments utilizing reserve capacities will let you know when the reserve capacity blocking non-majors will lift. Be prepared to register at 12:01 a.m. when the reserve capacity lifts. Some departments may offer a waiting list. Many students make changes to their schedules throughout the day and night hours while registration is open, so you should check frequently during that period to see if a seat has become available. Students who are persistent in checking for open seats are often able to get into a full course when another student drops a course.