Help! Couldn't get a final GED Transfer Prereq during Spring Term!

I had planned on finishing retaking my Human Bio course this Spring, which is my only
requirement left to transfer in the Fall. I wasn’t able to get the course that I need to retake and am stressing out.
Does anyone know what to do in this situation? Because schools want the courses completed by Spring, and I can’t find the course elsewhere/online in time, I’m curious if this will prevent me from transferring? Any suggestions on how to mitigate this problem? As a side note, I am a business major, so this course in totally unrelated to my major. Thanks!