I am a mature student self teaching for my IGCSE's , I only have the CGP complete revision and practice books for my chosen subjects(English , Maths , combined Science , and History) in GCSE form .
The books are for the correct examining body ( Edexcel) will these be similar enough to the IGCSE versions?
1. For Physics I have the CGP revision exercise, but I have no other revision guide from CGP. I only have the Hodder textbook and workbook for science subjects, and the official textbooks for English as a second language, Maths and Further Maths. I only did past papers for Chinese, as it is my native. So, you have the practice books and revision guides, make use of them, just like when I completed the entire Physics revision workbook from CGP. Physics is my weakest subject, but I still have confidence for a 8/9 when I walk out of the exam.
2. After you have finished each topic, go to physicsandmathstutor.com to find by topic past paper questions, so you have an idea on what will come up in the exam. As the exam period approaches, do timed past papers by year. After doing a few of them, identify which topics that you were weaker in (it was magnetism and electromagnetism for me, I only got 8/20 in a quiz on that, and also electrostatics), revise those concepts and do the by topic papers on that topic again. A few days before the exam, make sure you get familiar with the format by doing yearly past papers from recent exams.
I hope this helps you. Good luck!