By keeping your eye on your watch and allocating your time accordingly. Go for the questions that require little reading and the questions on topics that you are confident in first (jumping over the longer or harder questions). Then go back and spend more time on the longer questions. When there is only 5 minutes left, guess the answers to any questions that you have not finished – make sure you are submitting an answer to every question.
Get used to the time pressure by practicing the questions in your Revision Kit under time pressure.