What to do:
Get students to draw a clock in the centre of their page/book they are working from.
Then draw lines coming out of the clock.
In each section inform the students to write their revision notes.
They must only spend as long as the section shows.
See image below for example
and search the hashtag #RevisionClock for more!
Great idea by https://twitter.com/teachgeogblog
Get students to seperate the timings/sections themselves?
Set as homework?
Make each revision clock cross subject?