Today my students are taking their trial exam, some people call it a mock exam but I don't think it should be mocked. When invigilating real exams you can't do things like write blog post of course since there are regulations to abide by, internal exams are more relaxed, anyway I trust my students. I trust them so much that I even tell them which year the paper I'm going to use is - 2013. The reason I tell them is because I don't want them to practice the paper by accident. A few years ago one of my best students had already done the trial exam during revision so didn't get the full experience of sitting an unseen paper. She still got a 7 though so no harm done.