There is no revision guide for IGCSE Coordinated Sciences but there are guides for the separate Sciences, here is a list of them:
Your textbook (Complete Chemistry for Cambridge IGCSE, Gallagher & Ingram) is excellent but it is aimed at the IGCSE Chemistry rather than the IGCSE Coordinated Sciences, so you don’t need to revise it all. The following documents, tell you which pages to revise:
Textbook pages for Chem revision (by topic)