I feel your pain. I revised C3 thoroughly and am now finally scoring consistently good in past papers. However, mechanics makes me
and I study Physics.
In Mechanics 1, you either understand or don't understand what is involved.
I'm planning on focusing from Jan-early March on M1 since abstract maths takes longer to understand than straightforward core modules.
How did you persuade your college to let you resit all of your AS modules? My college only lets us resit 1 module but 2 at the most. I'm in a similar boat to you since I'm resitting C2+S1 + A2 maths = 5/6 exams whereas your sitting 6/6 maths module exams.
Have you seen how tightly packed the exams are? I'm only concerned at S1(5th June) & M1(3rd June) as they require opposite skills whereas core modules are easy since they are synoptic papers. What subjects do you study besides Maths?
I'm studying Maths, Physics & History. What are you applying to study at uni?