so before if you failed it you couldnt come back, you would be dismissed from the program. but with covid they changed it (not sure if they will change the rules back.) if you fail now then you would have to wait until another cohort is ready to take it. for example, my bf's friend didn't pass it, so he had to wait 3 semesters to retake it with the next cohort, because the cohort after your class might not be taking their exam in the next semester so you have to wait until they do to join their class.
hope that makes sense because its hard to type out and explain it! you can pm me if you want as well!