Just a note, C1-4 are compulsory modules so you can't do C1-2 and M1-4, for example, and get a full A-level (C1/C2/M1 is an AS but you then have a load of useless Mechanics modules). Also you can only do Applied modules 1 and 2 for Maths A-level (and only Applied modules 1 for AS), higher numbers can only count for Further or Further Additional Maths.
The only possible combinations are:
C1/C2/C3/C4/M1/M2
C1/C2/C3/C4/S1/S2
C1/C2/C3/C4/D1/D2
C1/C2/C3/C4/M1/S1
C1/C2/C3/C4/S1/D1
C1/C2/C3/C4/M1/D1