In quant, you can get about 4 questions wrong and still get 800. Most questions in quant should take you about a minute to solve. Data interpretation (4 questions) take around 3-4 minutes. These are the questions you should be prepared to get wrong. If you get easy DIs, well and good, solve them, otherwise simply guess and move on - dont waste too much time on them. The rest is pretty straight forward. Just be alert, re-read questions before submitting, and do casual common-sense checks on your answers (i.e check your answers, but not not so minutely that your average time per question suffers).
