Hi – have you tried Googling? This site sells software called Successmaker which is about reading and maths and is American (so far, so similar) seems up-to-date though I have no idea if the software itself is new: https://www.savvas.com/index.cfm?locator=PS2qJ3
Also – my cousin’s old school (Hurstmere in Sidcup) used to use it and you can still type it into their search bar and see the computer room set up with is…might be worth contacting them or any other school which used/usus it to see what they can tell you – just to query whether they still use it and what version package they have.