UCAS advice, who should I make my reference?

Long story short, I've began to study biomedical science at the University of Westminster, I realised that instead of biomed, studying mathematics was a better fit instead, so I dropped out of the course and wrote a personal statement for mathematics. I thought the deadline was for 26th January when in fact it was the 25th, but I'm trying to stay as calm as possible, even though i'm freaking out.

I'm making another application and I don't know who to make my refee.

Even if you thought the deadline was the 26th I got no idea why you thought you could get a reference in a single day. As the above reply has said contact whichever potential referee asap via phone NOT email if you're able to. Worst case if both say they can't provide a reference or cannot provide it that quickly then (I'm thinking this is good advice) contact each uni you're thinking of applying to, explain your situation and ask if you can submit your application and upload your reference in a week or two when onto their application portal or whatever they are using.

- My personal tutor for University wouldn't have anything to say about me. I barely knew him.
Okay, I'll call and ask them if I cant get those refrences. If I'm honest, I completely forgot about the reference untill I saw it in my UCAS application.

It's alright, take it as a lesson to just double or triple check things like this in the future.

I also checked your current course and see that the entry requirements are CCC / BBB. To be honest even though I'm only just applying to uni for this year I would be pretty confident that you would be able to get into a lot of universities for mathematics with those similar entry requirements through clearing even if you don't get a offer by May. What grades did you achieve in your A Levels?