Psychology at Undergraduate Level GCSE requirements

As above, you can resit GCSE Maths this year to get a higher grade - ask your school, its usually very straightforward. You will be rejected if you do not meet any essential GCSE grades, regardless of your A level predictions.
Psych at degree level is a science subject and is stats/data heavy so its about having an essential skill for those 'top' Unis, not 'nice to have'. This is why some Unis prefer two science A levels for Psych - York and Newcastle as examples.
There are numerous 'Psych and' joint subject courses that, because they are less science focused, will have a lower Maths requirement - Psychology with Law, Psychology and Sociology, Criminology and Psychology, Childhood Studies, Education and Psychology etc etc. Its also worth looking at general 'Social Sciences' degrees as they often include Psychology units.

Unless you fully understand all the stats in GCSE maths you will have catching up to do at the start of most Psychology degrees.

If I was to resit would I just do that alongside my alevels this year? Should I still apply?

Hi!
I’m looking to study psychology at undergraduate level at Uni of Warwick, Uni of Manchester, Uni of Bath, Uni of Edinburgh or Liverpool John Moores. I got a 7 in English Lit, 5 in English Lang, 5 in higher maths, 6’s in bio and chem and 5 in physics (for the sciencey/English/maths ones). I’m predicted an A*AA or AAA, and live in an area that qualifies for contextual offers. I have a lot of mitigating/extenuating circumstances personal to me including bereavement, trauma and health conditions. For majority of these universities, I meet the standard or contextual/widening requirements but not the GCSE maths one. I wasn’t provided any support regarding a maths resit and had no knowledge about having to do one, since I had passed. I’m currently in Year 13 studying Psychology (A prediction) Sociology (A) and Business (A*/A). My parents are not keen on a gap year for me, they’re fearful I won’t want to go to university after it, and it’ll disrupt my education.
What should I do? Do I still have a chance? I would love any advice below!
Thank you!!

I think you still have a chance, especially with your good predicted grades and contextual background. Most universities look at your whole application, not just one GCSE grade.
If your school or referee explains your situation, like the personal and health challenges you faced, I think the admissions team will understand.
You could also try emailing the universities to ask if they can be flexible with the maths requirement. Sometimes they can make exceptions when there are strong reasons.
It sounds like you’ve worked really hard, so I think it’s worth applying and seeing how it goes.