Edexcel International GCSE Chemistry Revision Guide - Collins IGCSE Essentials Author:Steve Langfield, Alison Wright, Dan Evans This revision guide helps prepare students for the Edexcel IGCSE Chemistry exam. IGCSEs are becoming increasingly popular with schools and are viewed by many as more rigourous than the standard GCSEs. Can be used in conjunction with the Collins Edexcel IGCSE Student Book for thorough exam preparation.