I've done the maths IGCSE last year, and I'm doing double maths A-Level so I'm doing the first 2 papers of AS maths this year, 5 papers next year, 5 papers the year after... And IGCSEs from all the other lessons...
If I was to do 1 a-level from maths, I would have done only the C1 this year for maths and 2 papers next year, 3 the year after...