I had the same problem, see above, and didn't get a reply. I tried using a save editor to find out the amount of Math lessons I needed to take (variable search 'CLASS') and it was counting down from 300+ (each class deducts 2 points). So if my math is right at 5 lessons a week it would take 60 weeks to complete, divided by 2, 30 weeks. That's around 6 months to complete!
I tried cheating (lowering to 10 points each) and got all 3 certificates. However, when I went to get the business degree, the receptionist wouldn't give it to me. Maybe she will after 6 months, if there's a timer. Or more likely, simply reducing points is not all I have to do, but I don't know which variables to change. Anyway, I can't be sure if what I found is right, however seeing as you're on month 4 I just might be.
I've stopped playing. Pointless seeing as how there is nothing much left to do once you have that job.