Urgent question: do you have to declare all results?

I have booked (privately) 2 maths a-level exams for next week however I'm not as confident as I'd hoped (wanted As but probably just scraping B in practice)

I still want to do them just for practice but I will probably retake them with a different exam board in the summer. Will I still have declare these for UCAS? If just cancel them I take it that wouldn't show up at all?

Thanks

UCAS can access your unique candidate number, which I believe shows every exam you have ever taken.

If you cancel those papers, prepare to pay a fee as I'm pretty sure you're charged for not sitting an exam.

That seems odd if I've paid to take them already it would save them marking money if I didnt attend? Unless there are set up costs that are being subsidized

Yes that's what I thought about UCN.

I have booked (privately) 2 maths a-level exams for next week however I'm not as confident as I'd hoped (wanted As but probably just scraping B in practice)

I still want to do them just for practice but I will probably retake them with a different exam board in the summer. Will I still have declare these for UCAS? If just cancel them I take it that wouldn't show up at all?

Thanks