tested:
Business communication with both specialised vocabulary and standard phrasing. About 5 are difficult, and of the other 15, 10 are not so difficult.
open EFL progress framework
assessment
If you are at level 7, you should probably have at least 12 correct.
At level 8, you should have 16-plus correct.
If you achieved 18/20, you can look forward to being the CEO of a prosperous company in the global economy, or else an English language teacher. At this level you are likely to have a better command of the language than most native speakers.
Becoming Bilingual
At levels 8 and 9, mistakes are rare. If there is a problem, it may lie in maintaining the language at a high level. Will be able to discuss complex issues, negotiate prices, delegate authority, and discuss technical matters as effortlessly as in the first language. There will be full self-expression, the ability to express nuances of meaning. Speech will accurately reflect the rhythms of language.("We've pared our margins to the bone. We've got rid of a lot of good people. And now the Board has finally decided there's no way to compete on price alone, globalisation or no globalisation. Bloody wonderful.")