I'm a big fan of mimicry as an exercise to help polish an IELTS candidate's pronunciation and general language accuracy. These two videos are a little older (originally published in late 2013), but I think they provide a pretty solid intonation workout and allow students to role play a strong IELTS performance:
https://www.youtube.com/watch?v=j0EhXD23nhA
https://www.youtube.com/watch?v=f41QJAsFG18
To candidates: how helpful are exercises like the above?
