[cabst90]

For 11-13 year old learners, I suggest trying to use Harry Potter (there is another very popular fantasy series, but I can't remember it right now.) There are several advantages in addition to the popularity. It is written for young readers. Many students may have already read it in their native language or seen the movies, which will make it easier to understand the content even if they don't completely understand the English. You can suppliment the reading with the videos.

Good luck...