I don't think it's incredibly difficult, but there will be classes that some do really well in, and some that you'll struggle in. If you've had biochemistry before, BCMB (Biochem/cell/molecular biology) will be fine, I didn't so it was mildly difficult for me. Embryology, I've never had, but I'm an RN, so certain things we talked about like TSH, LH, gallbladder fxn, just moderate things I knew, and our "anatomy" class was BREEZY for me. Because I do EKGs for a living, and I've had anatomy before so when we were tested on those things, it was a "refresh". So I think ultimately it depends on you. But if you came into this program with no prior experience I think you could manage.
This program is not what you think, and you'll learn that.