If you look at the one page summary of ACCA’s syllabus (section 10 of the pdf you can download from here) and compare it with the contents page of our notes:
Chapter 1-4 are syllabus area A Chapter 5&6 – E5 Chaper 7-9, 24 & 25 = B 12-15 = C 10-11 and 16-23 = D 26-29 = E
i.e. the sub-headings to group the topics on the contents page are meant to help you.