You can always call up the school and ask. I actually dropped my classes halfway through, as well, when I didn't even have an acceptance. But, then, those were just 3 classes for a minor. I still have my Bachelors degree. I took up a job instead. I suppose it's OK to drop them as long as they don't include any pre requisites and you're getting a degree towards the end (provided that your school needs a degree before enrollment).