Why I put mock exams in the freezer

In What does this look like in the classroom, Dylan Wiliam recommends that after a mock exam students discuss the questions to agree a best answer before self-assessing against the mark scheme. It’s really helpful for teachers to be able to tick, circle and highlight their way through a script. However, trying to get the most out of these marked scripts through self and peer assessment is problematic because as soon as a student sees a tick, you’ve done the thinking for them. This is where thermochromic pens come to the rescue. Declan Fleming explains.