Keep a level head
For most students, the Christmas tests are the first real indicator of how well (or not!) you're doing. This is a good thing regardless of your results, but can nonetheless cause some anxiety and stress for students as you want to do well. Try to stay relaxed and confident while doing the exams. Being worried and anxious won't help your grades, but staying focused and calm in an exam situation will give you the headspace you need to perform at your best and boost your chances of doing well. If you find yourself getting stressed, we've also got a piece about managing exam stress, so give it a read.