Retaking a levels

I did sociology, applied science and biology the first year of my year 12. I was struggling with my mental health quite a lot and had things going on in my life. I ended up failing my mocks that year. So I resat year 12 again and took different subjects including maths, biology and chemistry. I'm currently doing my year 13 a levels right now and I don't think I'm going to even end up with a D. Do you guys think I should redo my levels? Can I even? Because the course I want to do requires the grades ABB. What should I do??? I feel so helpless. I looked into foundation courses and it didn't exist for my course. Like should I do the exams privately or is there anything else I can do?