Maths A-level exams

Hey I am do the edexcel exam board and I am in year 12. I am going to be sitting the C1, C2 and S1 exams this year. If I was to get A's in C1/2 and then an D in S1 would I be able to retake just the S1 exam or would I have to retake all the exams ?
Thanks

Hey I am do the edexcel exam board and I am in year 12. I am going to be sitting the C1, C2 and S1 exams this year. If I was to get A's in C1/2 and then an D in S1 would I be able to retake just the S1 exam or would I have to retake all the exams ?
Thanks

I think you would just retake the stats. But there's a new syllabus coming in (I think), so is retaking an option?

There should still be resit seasons for old spec maths up until 2019 I'm pretty sure as year 12s are still doing them so they'll do their year 13 exams and then have another year to resit.