Always calculate accuracy/speed figures for individual sections and net. And try to maintain a stable figure of speed and accuracy. If there is an abrupt change in those figures, try to investigate and find out the reasons. Ideally 60% speed with 80% + accuracy will help you in getting good scores. But speed sometimes varies with easiness of the paper. Identifying the trends of speed/accuracy in aug/sept will help you to fine tune your strategy before the day.