Just a couple of ideas, but I hope they get you in the right direction.
Teach them how to use a calendar or date book. There are so many systems like this out there; just take a look at the calendar section of Walmart or an office supply store. We have some specially made for out students that includes a calendar laid out monthly-style. But after each of those it has a weekly-style calendar. You can easily create one in a word document using the "table" set up. The ones that have worked best that I've seen have the days of the week across the top and the various school subjects down the side; this creates a small box for each day of the week for each class. Whenever a student walks into a new class, they should right down whatever the teacher has written on the board as the day's objective or agenda. They can also write down any posted homework assignments. If the teachers at your school don't post this kind of information, perhaps you could coach them on this because it is a great organizational tool. I post my warm-up activity, daily agenda, and homework on the side board in my classroom next to the calendar.
Here's one that's a little out there, but it has worked for me - color coding. I've used this strategy in many ways, when I was in school and now that I'm a teacher. For example, if the students at your school have textbooks assigned to them, then they are going to have to keep up with all of them - making sure they get to the right class, making sure to take them home when they have homework. Plus they have to deal with other materials as well. I hated taking home more than I had to, or carrying around too much stuff at a time. I began to color-code my textbooks and folders for classes. Like science would be green, so I would cover the textbook with a green cover and use a green folder for the class. Some people may keep everything in one big folder, so folder tabs could do here. So when I looked to my calendar mentioned above, and I saw I had homework for science, I knew I needed to grab my green stuff to go home.