Memory training is a multi-million pound industry - your local library will have a selection of training boooks that will assist you. the simple truth is, we remember everything we experience - the trick is training your mind to recall what your memory has stored. A simple technique is 'association' - linking on image with another of your choosing. It's quite easy to do - imagine you saw 'Lord Of The Rings' - srtart your association with 'ring' - think film = telephone, or visualise a crown with a ring above it - maybe not ideal examples, but with a little practice, you'll easily find symbols and numbers to associate, and with regular practive, your memory recall will improve.