I'm not sure if calculus is still a freshman year of studies requirement for those who might not have taken it AP (or whatever it was called back in my [Iron Age] day) but I know it kicked my ass.
It didn't help that the Graduate Assistant who taught the class had no teaching skills. Mr. Peebles (that was his name, no lie!) would walk to the blackboard on Monday and Wednesday, fill it with theorems and proofs (or whatever), turn to the class and announce "This, of course, is trivial." He'd erase the board and repeat as often as possible in the allotted 50 minutes and then announce that there'd be a quiz on Friday. No time for questions or actual teaching/instruction/help.
Then there was Biology 101. I'd taken Biology I and II in high school. I spent my senior year studying genetics and DNA using a Scientific American collection of articles by Watson and Crick and others – the double helix was a fairly fresh postulation at the time. The final at ND required that I memorize species, kingdoms and phyla to pass. I called "bullshit." I anticipated being taught to examine, think, investigate and hypothesize. Rote was not to be part of the deal. "Spark" and curiosity were my anticipation.
I also got killed in a writing class and an introductory philosophy class. I nailed a sociology (or history, or theology) class and barely escaped with a 2.4 GPA. Second semester freshman year was not much better. I was looking at academic probation from the edge of the precipice.
Greg has good reason to be proud. Once one navigates the basic requirements it gets interesting. Not easier, but more likely to hold one's attention, curiosity and thirst.
Hang tough, Mr. Bryant. It ain't easy but it's worth it.