We usually do this kind of work in the mornings because Little Bean gets burned out pretty quickly, and then he doesn't want to come back to it for the rest of the day. I try not to put too much in the folder or he usually won't finish. At this point, I don't want to "force" him to finish, as I still feel he is young and learning should be fun and enjoyable. So, when he is ready to stop (which is usually after about 20 minutes or so), then we stop. But he is always so proud when he has completed his work and done well.
Here are some pictures to give you an example of how I organize the folder. We are working on Brown Bear, Brown bear this week, so that's why so much of the stuff is themed in that way (BTW, I got all my Brown Bear printables from this site. Go there, now! You will love it as much as I do, I am sure!).
My accordian folder and Little Bean's work folder:
The inside of Little Bean's folder:
And close ups of what's on the inside of the folder:
What system to do you use for your Pre K-er??