The title says it all really. Why do some teachers mark consistently over the years and then just before mock exams mark "hard" (as in essentially mark everyone down 25%)?
Is the logic here to encourage the students to work harder in their prep for the main event? Does it not backfire somewhat as a strategy when students who have been scoring 95%+ do their usual work and end up with 75% out of the blue and consequently have a good old confidence wobble?