This might be quite long, but it might help some of you. It certain has helped DD over her melt down earlier!
She has written her current timetable down on an A4 peice of paper for the next 3 weeks (until half term). On each day, she has gaps in her timetable, because she as already completely Maths, English Language and has given up doing PE. So she has crossed out those lessons.
For each those gaps, in a different colour she has written where she needs to be picking up another subject which needs extra work. For example, the art deadline is next Friday, so for every Maths or English lesson next week, she will go to Art.
Her French exam is on Monday and Wednesday, so she has noted that she needs to get an extra lesson in French too.
(I think it's pointless trying to cram a bit of everything and just concentrate on the exams she has in that week. If she doesn't know it now, she never will!)
With each week that we've looked at, there are less and less lessons that she needs to go to and more and more opportunity for revision lessons. This, of course, is all dependant of whether there is a teacher willing to take them in, but in my experience in secondary schools, Yr11's are number one priority right now.
Finally, she has written a list of things that she has to do, including finishing coursework or doing some revision. I even made her write down a couple of things that she's already finished this week, just so that she could cross them out. Physologically it's good to cross things out!
(Sorry, this is ridiculously long!!)
The summary is, she has it clear in her head what she's doing. I made her understand that it's OK to forget things, because the only thing she has to remember is 'where is that bit of paper that I wrote everything on!' It's just one less thing to remember! God knows I do it every day! 
Ultimately, she's gone to bed relaxed and focused on what she's doing. - Mainly going to Rae's party on Saturday, but hey, I tried!