Self-teach module, second year double maths?

Hi!
I'm on OCR taking Maths, Further Maths and Physics at A2.
This year I taught myself D2 along with the teacher-taught; C1, C2, FP1, M1, S1, D1; and I really enjoyed it! I was thinking about teaching myself another module this year (A2) as I am concerned that my mechanics modules may not be that strong. I was considering self-teaching S3 (along with FP2, FP3, M2, S2, C3, C4 in class); although, someone I know told me that M3 was a lot easier than M2 so it was worth self teaching. I'm hoping for an A* (haha) in Further Maths so I'm trying reeeaaallly hard to make sure I get 90+UMS in the A2 Modules.
Has anyone self-taught S3, M3, what was your experience?
Can anyone recommend one over the other, or a different module?
Is it worth doing it at all as I already have D2 (which I (think/hope) went well)?

Hi!
I'm on OCR taking Maths, Further Maths and Physics at A2.
This year I taught myself D2 along with the teacher-taught; C1, C2, FP1, M1, S1, D1; and I really enjoyed it! I was thinking about teaching myself another module this year (A2) as I am concerned that my mechanics modules may not be that strong. I was considering self-teaching S3 (along with FP2, FP3, M2, S2, C3, C4 in class); although, someone I know told me that M3 was a lot easier than M2 so it was worth self teaching. I'm hoping for an A* (haha) in Further Maths so I'm trying reeeaaallly hard to make sure I get 90+UMS in the A2 Modules.
Has anyone self-taught S3, M3, what was your experience?
Can anyone recommend one over the other, or a different module?
Is it worth doing it at all as I already have D2 (which I (think/hope) went well)?

What are you planning to do in the future?

Tbh, both Stats and Mechanics would be more use than D1 and D2

M3 is probably more interesting, although S3 may be slightly easier.