Joseann
I don't totally subscribe to the pull your socks up theory, but I do understand Germanshepherdsmum's comment that effort and application are required to succeed, or to at least to move upwards. The die is not always cast from birth or childhood. Inspite of the odds, (and I never knew my father, I lived in East London in a house full of random tenants, went to a comprehensive school - all very unusual in 1960/70s), children who have had a disadvantaged upbringing can and do overcome this, and do go on to have happy, successful lives (as I did).
It helps to have a good brain and intelligence, though.
Not everyone is blessed with this and we can see from many posts on GN that the only way to succeed is to go to university and anything less is considered to be failure.
Apprenticeships and other training schemes are considered to be second best.
Some children will struggle to pass their GCSEs, not through lack of trying and many will be suffering from Long Covid at the moment too.
The 11+ was criticised, rightly, as divisive, because children were thought of as 'failures' at 11 but attitudes haven't really changed at all.
The education system still fails a lot of children.