I was a valedictorian senior year of high school (one of 14, lolz -- hey, my H.S. was full of over-achievers), and also excelled at math and science courses. I'm also smart with budgeting and time management. There are probably tons of other things as well - stereotypes. But honestly as far as many type descriptions, I relate very much to them. It's just many of the stereotypes tied to F/T and P/J that I don't relate to.
ISFP's aren't 'supposed' to be skilled at these sorts of things.