I can’t really comment on whether the maths content works, but I was quite disappointed with the buying process. My first package (£35) included two small books and an eBook. The second “upgrade” looked like it came with CDs and more books, but it was actually just digital files costing £102. Once you open the files, you can’t get a refund. There’s very little physical content, and the company won’t offer goodwill refunds, so definitely check exactly what you’re getting before buying.
gcsemathsinfourweeks.com