I also learned to sew from my mom. When I took Home Ec. in high school in the early '70's, my teacher wanted things done a certain way, and I kept doing them the way I learned at home (not on purpose, just didn't understand how to do it her way, and was too shy at the time to ask for clarification). She didn't like that, even though the end product turned out the same. I wasn't one of her favorite students because of it! I ended up with a "B" in that class, even though I was an "A" student in most of my other classes.
And by the way, at my small country school, at least one year of Home Ec. was required for the girls.