Here's the syllabus for the Cambridge Critical Thinking AS & A level
https://www.cambridgeinternational.org/Images/597412-2023-2025-syllabus.pdf
They used to offer it as an end of GCSEs subject in grammar schools in the UK when i were younger (Maybe they still do, i don't know). My Ex took it.
I (a pleb) went to a plebs school though so didn't get the opportunity
Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/118.0 master race checking in