Ah. The OCR process is positively medieval by comparison. You can get a sense of it by reading
this web page (if your school uses A2C) or
this page (if they use Interchange).
OCR seem to allow withdrawals even after you've already sat an exam. See
this page which says (with my added emphasis):
"After a certain point – approximately
one week before the issue of results for each series (see key dates) – it is no longer possible to make changes to the qualification details; only corrections to a candidate’s personal details will be accepted.
This is also the final deadline for withdrawing entries."
Clearly your school's exams officer will be busy whilst exams are happening. However, they might be a time
after exams have finished but
before term ends where they could withdraw you. So if you're going to ask the OCR support team anything, I'd ask them to confirm that you can be withdrawn even after having missed each exam, and ask them what the final date for doing so is.
Then, armed with that information, explain to your exams officer
why a withdrawal would be of benefit to you (rather than having an X on your results slip) and ask whether they would be in a position to process the withdrawal by whatever date the OCR support team supplied.