Anyway to return to the point of the thread: the concepts of 'brilliance' 'talent' and 'ability' are all entirely abstract social constructs. So girls don't have an innate different idea of what constitutes achievement or ability.
What they have is a year of being praised as hard working, while their male counterparts are praised as being clever/smart/talented.
This doesn't do either gender any favours.
Our entire society has a poor concept of achievement that is heavily biased in favour of 'brilliance' and speed of getting to an outcome, over quality of the final outcome.
Better to be fast and wrong than slow, methodical and correct!
Why else do we prevent children from retaking a year of school or even university? Why should it matter if someone has been studying material for longer before they master it?
In many other countries this imbalance doesn't occur and the emphasis is on what level you have achieved, not how fast you got there. These places have better rates of women in STEM.
I see male physics students day in day out, who think they have 'reached the limit of their ability' and are despairing. There is no 'limit', you just keep putting in the time and you steadily improve! But they have never been taught to view learning that way and hence drop out with their hopes shattered.
Yet another reason male suicide in young adulthood is a problem.