I am confused about the rules for transfer credit...

“Northeastern accepts up 32 credits of Advanced Test Credit toward your total required program hours. Advanced Test Credit beyond the 32 limit can still be used toward course requirements.”

My son will have 30 credits for AP classes, plus has a 3 credit dual enrollment class. So that makes 33. Does he start with 32 credits or 33 transferred in?

He will start with 30 likely as you can’t exactly transfer in half or two-thirds of a class. You can choose which classes are used for credit. I’m not sure if you’ver checked that already, but the three-credit class may not be worth three at Northeastern (as most classes are four credits), so check the transfer equivalency database to see what credit it will count as specifically.