This idea is overused as heavily dependant on which school you go to. My school taught a finance course, and gave advice on job seeking and interviews.
Also, mitochondria is usually taught at GCSE in the UK at least, which is not the last year of school. 'Mitochondria is the powerhouse of the cell' is very much a meme, it might have been interesting to use any other piece of useless information taught in schools instead.