I'm having a job interview in a month. My writing, reading and listening are good. However, I have weak conversation skills. I need an efficient resource to improve my speaking. Any resource is acceptable (website, audio-book, online course, community, tests) and It'd be great if you had a successful experience with it yourself. I don't need to learn English, just the everyday conversation with fluency. The slightest improvement is good enough for me.
I don't know if this is an acceptable question here but any help is appreciated.