well that depends on the child and the education - i think sometimes we have to remember not all kisd can be university material. i would also not undervalue the socialisation aspect. knowing how to interact with other people is a skill. knowing what school is like for all its good and bad points is useful for when your kids have children. and for your kids to talk about as adults.
i am forever having conversations with my children about some geogaphy teacher who could hit you at the back of the class with a piece of chalk, or the maths teacher that taught us by playing darts, or the german teaher that stood on your feet ( fat fcker) if you gave cheek - so he could say it was an accident if he was pulled - but he did it on purpose.
i even hada conversation with my 12yo dd about creepy teachers. and my experiences with "accidental" breast brushing, and down your blouse looking.
also talk about my teacher crush...mr critchley. he was loverly.
and also about the nice looking teachers at her school.
theres so much more to school than formal education. it serves me even now. i left school with GCSEs in fck all ( art!) and made it all up later. i hated every second of secondary school - i would rather jump into a food slicer than do it again. but the memories and experiences serve me now. in communication with my daughter and in knowing what secondary school is like, to try and ensure that my daughter gets the best possible experience out of secondary school - lessons my mother taught me when i was confronted with bullies " walk away with your head held high, you are better than that"
lessons i teach my daughter, tell the teacher, and knock em out if they hit you.
my mother bought my school stuff off the market.
a constant source of ridicule were my hi-tec trainers.
my daughter wont be in that position.
the sleep overs and parties she goes to, the best friends she has, the "oh my gaawwwwwwwwwd what can i buy my bestest, bestest friend in all the world mum?"
there so so so very much information other than formal learning