SIS doesn't let you enroll if there is a conflict, I've tried before. But you can get your DE exam re-scheduled for $50 you'll just have to talk to an advisor about getting around the SIS problem
I took a course once that had a lecture at the same time as an optional tutorial for another class. I just needed explicit permission from the prof to miss the tutorial, and then the advisor manually added me to the class.
Talk to an advisor. I can't imagine they will have any problems enrolling you in the course.
It is an EDUC midterm? If that is the case do you know yet whether or not is a take home midterm? Many of the online EDUC midterms/finals I have seen are take home ones, in which case you should definitely be able to get them to add you to the course.
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Talk to an advisor. I can't imagine they will have any problems enrolling you in the course.