I've just put together this interactive checklist for studying GCSE maths that you're free to use:
https://www.thinkskills.net/lesson/checklist.html
Items that have been studied can be clicked or tapped on to mark them as completed. You can then click on the save button at the top to save your list.
The app currently lists all of the topics for higher and foundation papers. I'll be adding a feature to you you to see the foundation paper topics in the next day or so.
Let me know if you want to see any other features.