I know what you mean. It is really hard to take nursing electives. Because of clinicals scheduled for two days, it is hard to take anything. At the Mac site, clincials are Thursday or Friday, so you cannot book any electives for Wednesday evening, or Thursday or Friday. And that pretty much leaves no electives left.
If you really want to take those electives, I would recommend staying registered in the course and waiting to see when you clincial is going to be. The lists will be posted a few weeks before the start of school, so you can change stuff around then. And you are not going to want to take anything the night before clinical, since you really need that time to do patient prep for the next day and try to get some sleep before 5:30am rolls around
Good luck trying to find electives. Night classes work the best, or take them them during the summer.