Are you having to urge your DC to revise or are they organising themselves and getting on with it? DS1 would do no revision at all if we didn't make him. DH has mapped out a revision timetable with free time pencilled in, but even then DS tries to slope off.
Dd seems to be sporadically doing some......although not every day. I am keeping well out of it. We have had a chat about "this is it" ..." the next few weeks count"...and " you can always retaake maths in November