Just, tbh, I am not defending the system of 'targets'.
The point I am trying to make is that, however well you are doing, it matters if you miss school, and you WILL have to catch up, because in most schools now, huge efforts are made to match what a pupil can alreay do to what they need to learn next in order to progress. I think, as an able child who now has able children, schools (at least primaries, with which i am most familiar) are hugely better at this now. Children who are ahead get given work that matches their ability, and those who need support get differentiated work too. Education in my childhood was much more 'one size fits all'.
Many arguments on this thread are based ion 'if you are ahead, it's OK - you'll just be a little bit less ahead for a bit': schools, rightly, feel that if a opupil is ahead, it is their job to ensure that they make progress from their curent position, not mark time until everyone else catches up.
Before I get flamed, yes, i know some schiools aren't great at this. But that is, and shiould rightly be, the ethos - not an'Oh,. you're able, you can miss schiool, you won't learn anything here for a bit anyway'.
Euhah, I can imagine that repeating the same year twice was excruciating. What I want back is the year I didn't have, with all its social bonding and background work for secondary subjects and introduction to homework, not to repeat the first year that I DID have.