I think the big ones for me would be a general "Financial Capability" education which would cover several of things talked about above such as how to understand your payslip and deductions from it, how to budget, what types of current account exist, what insurance products you may need at various times of life and how they work, how different forms of credit (credit cards, bank loans, etc) work and what you should think about before using them, different types of savings products (savings accounts, regular savers, ISAs, etc) and how they work, what a rental agreement should look like and things to look out for, how mortgages work, what are pensions (state, occupational/private pensions, etc) and how they work. None of these things need to be gone into in any great detail as the goal should be to ensure that everyone has a basic understanding of how all these things work as everyone, at some stage, will need to deal with at least some of the things from the above list so it's important that they understand to at least basic degree what these things are. Doing that might go at least someway to ensuring that people are able to make better financial decisions which can only be a good thing whether your middle class or working class.
I think basic first aid is another good shout by the by not even for dealing with the big things like CPR or responding to a stroke but for the seemingly small things like what do you do if you mum, brother, sister, dad, friend or even a stranger starts choking? Teaching everyone how to respond to choking would no doubt save quite a few lives!
Perhaps we were lucky but we got a talk on that at my Sixth Form during Lower Sixth when we were making our decisions about post A-Level life.