Hi, I'm also in Year 13 and honestly, I don't think you should worry too much about it. Now, having said that, I would also recommend that once this set of mocks has been done, you start revising thoroughly for your actual exams. Always remember this, A-levels are a marathon, not a sprint. Try doing these mocks as best as you can but focus more on the long run, and also, most teachers will be lenient about prediction grades, so don't worry too much about it.