The course is here: https://www.memrise.com/course/483081/business-english-b2-full-audio-full-context/
It has been revamped to get around weaknesses in Memrise. The course has complete high-quality audio and context examples are provided. I’d put the level at B2 upwards.
Each level is based on an article, and the link to this article is provided in the level header. The way to do this course is to skim-read the article first, go to this course and run through the words in the relevant level, then go back to the article to read in detail. After that, learn the words the usual way. Memrise will assist you in remembering these words you’ve just learned in context.
As with the majority of my courses, new levels will be added from time to time, depending on the popularity of the courses.