Suggestions greatly appreciated!

[Nads]

Hi everyone,

I've been hired as a part time efl teacher at a primary school, mainly grades 2-6. They will be grouped according to their level, as these as foreign students and the goal is that they are able to cope in the mainstream classroom.
My question is, what kind of books would be suitable for the different levels (beginner - intermediate)? I have a lot of activity and games books, I'm really looking for workbooks and so on. Also they need to be able to get back to the class as soon as possible so the books have to lend themselves to that as well.

I would really appreciate any suggestions you may have because I'm actually a special education teacher and this is something new to me!