I think one of the biggest things that they don't really teach you is that most jobs end up having only a small percentage of your time spent doing the unique element of that job.
It's import because a lot of people get scared away from careers that they think involve a lot of math, which they think they don't like. In reality, even in math heavy professions, math is only a small part of what they do, and the parts they do are so routine that they aren't hard.