First of all, just because it’s funny, here’s a native speaker who wouldn’t pass the IELTS Speaking Part Three:
http://www.youtube.com/watch?v=lj3iNxZ8Dww
To make sure your students aren’t reduced to such levels of incoherence, here is a whole stack of IELTS speaking materials:
I’ve also got a whole stack of Part Two and Part Three exam questions on various topics if that is of interest to anyone. Just put a request in the comments box and I’ll put them up:
TEFLtastic 