Yeah, mmzz but I just worry, you actually get involved!
I guess I have always done so much with DS2 that I leave the others to fend for themselves somewhat. You might find that your DS2 doesn't need as much help. The teachers will be a bit more organasied and experienced with these GCSEs as well.
DS3 used an online revision guide that his teacher gave him access to, called 'Collins OCR GCSE revision computer science all in one' and a YouTube channel called 'Craig and Dave.'