If the program you intended to get into is a graduate program, you have to take 9 credits in order to qualify for a full time F-1 student. Whether you can get accounting OPT, it depends on the school program, how the school fill in your I-20. Usually, the int'l advisor will sign the form for your OPT. Therefore, the school has to consent it first. Check with your school to see what they will say.
Runan Zhang
attorney at law
runanzhang.com