Yes most certainly in the vast majority of subjects, except for the ones that I am really obsessed with and English Language.
My English Language development was weird, I got a low level 3 in my year 6 English sats which is bad, I was in special help classes for english for most of my time at school, then all of a sudden when I was 15 something just clicked and my Essay grades went from really low to A/A*'s and I got an A* in my English Language GCSE even though I did not have a proper English teacher for the whole of that year, was in the bottom group with a lot fo really distruptive pupils.
So that chart would probably be pretty much flat then just suddenly shoot up right at the end for me.
But for the most part your graph does really describe how I learn.