You'll have 57 minutes to complete 50 multiple choice questions- you need to score 45 out of 50 to pass. There's a few possible answers to each one, so make sure you take the time to read each question thoroughly. If you get stuck on a question, you can flag it, carry on, and come back to it later. Often, looking at it afresh will help you identify the right answer. Once you've completed all the questions - if you have time, it's worth going back and and checking your answers, as you can change them at any point. We've written a handy guide to the theory test questions, which gives more advice.