Since the UK Department for Education set out that all GCSE Maths assessments should test reasoning, interpreting and problem solving skills in at least half of the GCSE questions, there has been an increasing demand from students to get access to more content, in order to practice those questions that not just test the skills taught in schools, but those types of questions that assess those reasoning and problem solving skills.
Space is provided within all workbooks to answer all the questions, so no additional paper is required.