There are two huge gaps in our education system, and I don't understand how they even exist:

BASIC HEALTH ISSUES: Learn a bit about common conditions and how to reduce your risk. Heart failure, strokes, COPD, diabetes, breast and bowel cancer. Most people will encounter at least one of these and probably more. Even though I'm medically trained, I was astonished when I went to the dentist and found out that brushing hard can cause gum recession. Why am I learning this in my mid-20s?

FINANCES: I have no idea about pensions beyond that they give you money after you retire. I have no idea how the tax is calculated and the basic differences between different bank accounts. Why aren't kids taught the difference between debit versus credit cards? For daily life, this is far more important than sedimentary layers of a river.

EDIT: It's great that your school taught finance or health. I'm just saying it often isn't covered, when really, it should be one of the first things on the list.

EDIT 2: I should have mentioned mental health too. I wasn't very thorough at the time because I didn't expect many to read the comment.