I am at my wits end too is how to get my DS to knuckle down And revise for his GCSE's...?!
He always seems to find something else more pressing to do ... Like Playing his guitar, or playing on his phone / computer ...
I tell him it's only a relatively short time that he has to put the hard work in but it doesn't seem to be making much difference ...
I think I need to take drastic action from Tuesday - AIBU to remove his phone / computer ,,,!? 😫