[Secondary school maths] International A-Level (IAL) resources?

Hi,

I am an adult learner who did GCSE Maths back when I was a teen living in the UK. I now live abroad and regret a bit that I did not do A-Level, so I am interested in self-studying the content from the International A-Level as an adult. I was wondering does anyone have recommendations for self-study courses / textbooks that cover the IAL syllabus well? I was looking at Pearson Edexcel, specifically the papers Pure Maths 1-4 (P1-4), Decision Maths (D1), and Stats 1 (S1). Thanks for your opinions!