Teacher Discussion Forums

I teach an after school class at a Korean public middle school. The students are from different schools and are of a higher level than normal classes. I have not used textbooks for a while and so I'm guessing when I say their level is about pre-intermediate maybe intermediate at a push. There are 15 students per class.
I am looking for a textbook to base writing lessons on as I do not have enough time anymore to write my own lessons for them and have not taught writing before.
Anyone know any good writing textbooks for 14-16 year olds?

Thanks