At this point, you need to make a personal decision. The system will consistently skip you over if adding the course will put you over the 19.5 credits. You can decide to drop another course, drop off the waitlist or petition for Excess Credit permission.
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will need to discuss your options with your academic advisor and petition to be allowed to take excessive credit by completing the Excess Credit form from the Office for Academic and Pre-Professional Advising. If approved, you will be allowed to enroll in the excess credit course.