Hi there,
I've been going to Toastmasters since June of this year and I think it's a great organization. At the San Diego chapter, we have 2 people give prepared speeches with 2 evaluators, one for each of them who also have to speak. There is a table topics section (which is the most challenging) where random topics are assigned and you have to speak for at least 45 seconds and incorporate the word of the day if you can.
I joined toastmasters primarily to improve my overall communication skills and to try and limits the "ahs and ums" I would use when I speak or teach. The environment (at least in my chapter) is very friendly and supportive and everyone has varied backgrounds, which makes it very interesting.
I think if you need practice, or would like to further improve your skills, this organization is great. I think it would be most helpful during your interview. Practicing the questions on interviewfeedback.com is very helpful.
Hope that answers your question,
Arnold Cuenca
MS-IV
Western University of Health Sciences