Hi, I haven't received any information other than it being a proofreading exercise that would take 25 minutes at most. The platform it is administered on is skillsarena, which I have researched and not found much on!
Judging by the time frame, and cementing some of my own knowledge, I presume the skill you need most is attention to detail. Little things like spelling, punctuation, grammar, etc would help you stand out. For example, depending on the recipient, you may need to adjust words in the original document from “ROI”, to “return on investment”. Or adjusting words from “know” to “now”, for example.