Re accuracy, if I first submit an incorrect answer then acorrect one does this affect my score? Also, why do the cerificates sometimes say silver, and sometimes gold?
[Improving your accuracy can only improve your score as accuracy outweighs speed. Speed only counts for part B challenges anyway, and at this stage of the competition only as much as the time bands. We give Gold certificates to the top 25% of competitors for each stage, Silver for the next 25% and Bronze for everyone else. Hope that is clear. Harry]