Happens in most schools, I'd say
Well you should say less, because you have no idea what you are talking about.
Kid isn't doing well at GCSE, withdraw them so you don't ruin your A-C/progress 8 rate*
The most common reason for kids being withdrawn is parents begging for them to be allowed to drop subjects. This does not in any way improve results statistics or progress 8 rate.
If a kid didn't turn up on the day, rather than risk a U, the exam officer would withdraw them from the whole exam, wiped any record.
can't be done, and isn't done,
For A level, schools await the AS result then get kids to either re-sit the year so the original grade is over-ridden (and there's no record of it)
again, can't be done, all exams are recorded, and have to be put on UCAS applications
Schools can't normally offer places to resit the year anyway, as they won't normally get the funding,
or the kid can't carry onto A level. Not sure how that's going to work with the new A level curriculae.
Its working fine, with schools setting their own internal exams to use to predict grades with, instead of external AS exams.