Looking around I see a lot of Edexcel, AQA or OCR students, but it's surprisingly rare to find someone doing CAIE Pre-U/IGCSE/AS/A Levels. Not only in Reddit but also these discord servers, r/6thForm, yellow A level server, UK maths etc. There's a discord server which is like a group study for CAIE students, they have a huge collection of resources, group study on voice chat and of course, asking questions. The permanent invite link is https://discord.gg/9Dmgx3m (which never expires). Hope to see you there soon!