Reddit mentions of Cambridge IGCSE® Chemistry Coursebook with CD-ROM (Cambridge International IGCSE)

Ah, Cambridge IGCSE is different. They still use A*-G in some subjects.<br />
Make sure you're doing Cambridge IGCSE as opposed to edexcel IGCSE though of course, and that you are <br />
definitely on the old A*-G syllabus.<br />

However, you said you are doing the 3 separate sciences now. This means you will want the coursebooks for biology, chemistry and physics. Those say they're for the 2016 syllabus despite the Cambridge website having a different PDF document for the 2020-2021 syllabus, however due to the fact that I can't find any later versions of the textbooks and the 2020-2021 syllabus doesn't have the giant warning that it's been revised, I think this should be fine.

EDIT: edited because putting two *s in the same paragraph makes a lot of it go italics, so I solved this with code format.