Useful to find out certain topics you struggle, but not for in-depth revision
It is only good to identify the types of topics to revise on and to get familiar with the general syllabus for GCSE Maths. However, it is not useful for in depth revision; on many of the topic questions, they only incur yes, no, one answer types (like Kahoot) rather than actual working questions that would look like an actual exam one; this happens mainly on the more harder topics. Furthermore, the mark scheme and the workings is ridiculously confusing; it makes the topic seem harder than it actually is. Examples include the random numbers coming out of nowhere without any given context (it wasn't even shown in the clues). When I also revised for my Business GCSE, the notes that were provided were so thin and not in detail, with just one image and barely any writing, not even one line. I would not recommend this website nor the app for revision purposes, but it is good to find out what topics you struggle with, so that you can pinpoint the ones you can revise on elsewhere.