@skieurope - Yes, I know right lol. Husband is a geeky math / science guy with current knowledge so it was clear to him reasonably quickly my error 
I made an assumption lol. Won’t be doing that again. Kid is looking at super reachy engineering so the 750 is a bit borderline. I think will evaluate towards end of year to see how kid feels. Has Math 2 (800) done so just needs the science angle covered.