Is it possible to take A Level Maths if I move up to higher from November mocks?

I’m year 11 and about to take November mocks. I was kind of lazy throughout school but I’m currently trying to achieve a grade 5 in my foundation paper for November mocks and move up to the higher paper. I plan to catch up with all higher content and achieve a grade 7 by the end of the year so I can take A Level Maths.
The problem is, the applications are in November, and my last exam grades were not great. Because I was on foundation, I got a grade 4. I’m worried that 6th forms will not accept me for a conditional offer even if I get a grade 7 at the end of the year due to me currently being on foundation maths and my poor previous grades.
Plus my November mocks are foundation paper, and I heard that 6th forms look at your mock results to make their decisions. Can they see if I am on foundation paper and even then would they give me a conditional offer with a grade 5?
Will I be allowed to take A Level Maths if I achieve a grade 7, or is it too late to do so? It’s kind of stressing me out