Look at the Bourdon tool that’s been posted in this forum for drivers, it’s a windows application that you can use to practice SCAAT, there’s a toggle within the app itself to change from dots to symbols. The practice materials that they send for the concentration tests are poor.
Edit: this one. https://www.railforums.co.uk/threads/group-bourdon-tool.156417/
Edit: this one. https://www.railforums.co.uk/threads/group-bourdon-tool.156417/