There are loads of things you could productively do, but won't lead to any extra points. Volunteering with St John Ambulance, Red Cross, Scouts/Guides, working in a charity shop, get work experience, get the NPLQ, learn a language, learn an instrument, take up a new sport, do ECDL, study a MOOC, read around the subjects you like, learn to code... The list is endless and you'll get some great skills which could help beyond A-levels. Good luck and have fun!