Well you can look at your Chem and Bio SACs as revision.
The rest however, it kind of sucks and i can see the problem of dividing time.
One of my teachers overheard a student stressing out saying they haven't started revising at all for midyears. His advice was something like "Just use the time you have left, efficiently. That's all you can really do." It sounds simple but really, that is all you can do.
Try get rid of things that hold you back. I get massively distracted at home, so untill exams im planning on staying at the local library near my school till 8pm (when it shuts). There have been days when i came home and did no work all day, i procrastinate heaps, so eliminate anything that is wasting your time.
I guess try prioritise your SACs in order of how bad you'll do in them if you don't study and how bad it will affect you VS the time you have left to study for it.
Use time you didn't even think you had, on my ~30 minute bus ride, i stare out the window or listen to music half the time. I should probably start reading or something on the bus. That's 1 hour each day (30 minutes up and 30 back) that i just waste all day.
Maybe try find more efficient ways of studying or note-taking, google will help with that.
Cant think of any advice, you've only got a set amount of time, theres only so much you can do with it and exams are close. Thats the reality of it, not much you can do to change it only enhance how you use it a little. In the end we still only have 2 weeks left.