On its website, Oxford offers quite a few simple tips and techniques to relieve exam and revision stress. Some are as simple as going for a walk or sharing your anxieties with friends or family. Others are managing their time and not waiting till the last minute and cramming. "Good preparation prevents poor performance!" Confidence can go a long way, and they also suggest you balance your priorities well and take the time to decompress and listen to music or watch a movie. So review their tips and techniques to familiarize yourself with what they suggest, and align your answer with their suggestions. This can go a long way in assuring them you have what it takes to make it.