It is tailored to AQA. I think it might be good enough for Edexcel, but I'm not sure about the iGCSE variations.
The relevant passage dealing with that is in the foreword. Paraphrasing...
"... up to 50% of the marks available are for exam technique..... An exam has to cover so many different skills, that it becomes very artificial.
I (Mr Salles) have a degree in English, 24 years teaching English experience, a lifetime of reading every single day, and despite all this I wasn't able to get 100% when I sat the sample papers for the new GCSE until I looked at the mark schemes. It has nothing to do with English, but everything to do with the artificiality of exams. I'll show you how to get these marks too, so you can get 100%".