Failed my Alevels because

the textbooks given to me by my sixth form were in such bad conditions that I could not bear touching them. There were dirty and of course there were so many germs on them due to many people having used them before me. Whenever I did use them I would have to wash my hands afterwards. Or use sticky post-its to stick on a page then use the post-it to turn to the next page.

does this count as extenuating circumstances?

the textbooks given to me by my sixth form were in such bad conditions that I could not bear touching them. There were dirty and of course there were so many germs on them due to many people having used them before me. Whenever I did use them I would have to wash my hands afterwards. Or use sticky post-its to stick on a page then use the post-it to turn to the next page.

does this count as extenuating circumstances?

seems reasonable. maybe talk about how heavy the textbooks were too, the strain on your back from carrying them around deffo contributed to this.

would fully endorse a formal complaint about the sticky textbooks and their weight to the exam boards asap.

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lmao, you should have bought new textbooks yourself if that was an issue tbh

oh yes, one textbook actually came with someone else's sticky notes stuck on half the pages. when i took them out i found they had made the pages all sticky - turning the page was a genuine struggle.

this was what came to mind but it was too late by then

I understand how the textbook thing would be an issue, honestly - but you should have bought new textbooks as soon as you had issues.
If you perhaps had OCD then that may qualify under extenuating circumstances, but I'm not well versed in extenuating circumstances.