Hi!
If anybody is looking for native english teachers to prepare for the IELTS test, I found a great plataform with several teachers from the US, the UK, Australia, Southafrica, etc. It's called http://www.ourlanguagecafe.com and the teacher I got helped me improve my speaking skills. I'm about to take my IELTS examination and I feel really confident when it comes to the speaking section.
Hope it can help you!