This is not sponsored, I am just sharing my advice with you.

If you would like to improve your Business English vocabulary in your own time, I recommend Bill Mascull’s Business Vocabulary in Use series. This series is an excellent companion for lessons with a teacher, or to learn in your own time. There are elementary, intermediate, and advanced versions to help you improve your Business communication at whatever level you currently are.

The CD contains listening exercises which will use a variety or native and non-native English accents to help you improve your listening. The exercises are appropriate to most businesses and well designed to help you improve your day-to-day English easily. These books are easily available to buy on Amazon.