Oratory1 - I was going for phonetically similar but just enough different to not make the extended searches on my posting history easy!
I spent a couple of hours helping DS1 weed through all his old GCSE notes and jotters (he has a better name but I can't think what it is). I wanted him to make up a file for DS2 that would be useful when he does his GCSEs in 2020.
We found all sorts of pristine handouts that his teachers gave DS that would have been extremely useful a few months ago, had he bothered to walk the three steps to his bookcase and look in files. Not using them added days of extra work. 
Anyway, that's another mistake I won't be repeating with DS2.
I also found a little summary table to fill in that the school gave us back in September. It lists the subjects, the target grades, and DS was supposed to write in his mock results and various monitoring predictions as well as what he was hoping for last September.
I've taken it and I'm looking at it on my desk now (having just filled it in for him!). I'm going to keep it until the 23rd and see how good the school predictions were.