I keep not answering questions

This depends on what you mean by "I never answered it"?

I mean that I didn't see the question; and going back over the test I have no memory of that question whatsoever

Are putting down any answer? Are you answering what you thought the question was at the time?

No answer whatsoever. I'll give an example of my last test. It was a logarithms year 1 test. It was marked out of 52. I got 50. The 2 marks I lost were a question I didn't answer because I didn't see. I had no memory of that question being there whatsoever, no workings related to that question, nothing. This is what is happening in my exams.

I suppose this could be your mind racing ahead and answering what you can rather than seeing what is actually there.
The good advice I received for Maths exams which I always followed was:

It's not answering what I can; when I get my paper back and go over the questions I didn't answer I literally have not once failed to complete them in less than 5 minutes. That does sound like good advice though (although there aren't really questions I'd struggle on nor waste enough time such that I can't finish). Thanks

Even if not needed for prioritising, it's good practice to subconsciously think about the questions rather than writing straight away.
If you are blanking out, (and it is only happening on papers for one subject), then I can only suggest you are racing through too quickly.

Hi. I'm a pretty good student. But every time I get a test back, I see 0/2 for a question, then I look at it, and realise I never answered it. I never run out of time. I don't know why this is happening. It has happened 4 times in Maths, twice in physics and once in computer science (about once every 3 tests) and it happened in an actual maths mock (im y12 but it was y13 which is why i've taken so few tests in total) losing me 9 marks. How do I fix this?

Hello,
This could be because of your current stress that you unconsciously skip over questions. Try and tick a mark next to each question when you answer it and go back and check that all questions were ticked before submitting your paper, this way you’ll notice any questions that were left unanswered.
-Sarah (Kingston Rep)