Hmm, I've been musing about this. Ds is in Y8 at a fairly academic school (selective) and is doing ok but not brilliantly. But then the ones who are doing brilliantly are probably brilliant, which, with the best will in the world, he is not, although he is well within the schools "ambit". So he sort of needs to keep his eye on his own game and do the best he can. Its not about setting for us, as they only set for a few subjects and in any event he is probably in the right ones for him already.
I definitely agree that you are laying down patterns now for future summers of work up to GCSE and beyond. DS seems to have revision sheets for each subject. He does not have much of a reasonable idea how to marshal his time and actually work, though, and given any option at all would be very happy to spend the time on the X-box, whatapp'ing his mates and watching old episodes of Top Gear.
This is what we have done. At the beginning of the half term we sat down, looked at what he had for every subject, printed it up if necessary, and put it all in a file. That was a very good 2 hours work (for me as well as for him!). He now can easily read now exactly what he is going to be tested on and needs to look at.
We agreed that he would do 2 hours of revision a day, split into 2 x 1 hour sessions, split into 30 mins, 10-15 mins break, then another 30 mins. We also have a quick tick list to check which subjects he has done, to make sure nothing gets left out. But he chooses what he is doing each day, and he also chooses when to do the work. I've not looked at what he is actually doing, nor have I tested him etc - all I have done is worked with him to set a framework so that we actually know the work is getting done.
I'm at work, but the spy in the camp (younger DC!) tells me he is sitting there for the alloted time. I have no idea what he is actually doing but I think I've struck a good balance between a good framework/providing support and spoon feeding or whatever. If the exams go badly or not as well as expected, we can say "what do we need to change to that regime to make it work better". (My other DC will be able to set all this up by themself as they are much better organised but DS isn't and he really needs this input).