The written report was looking at ways to improve water conservation. BUT, knowing this is of no advantage to you because they are looking to test your ability to digest the relevant information in a short amount of time and produce a concise, but relevant report. I would strongly advise against doing any research on this area prior to the day as the instructions specifically mention that “no previous knowledge is required”, as they want to see you analyse, process and regurgitate the information that is in the booklet - nothing more!
Remember - use subtitles, have a short introduction and conclusion. Punctuation, grammar and spelling are also key. Spend a maximum of ten minutes reading, maybe even closer to five minutes. I found I struggled to finish with only 20 minutes to write!
The group exercise was concerned with weighing up a number of proposals for a client who wanted to improve profits, whilst also highlighting their environmental measures. Again, there is no point in researching this prior to the day. All it requires is some common sense and good reading skills. Perhaps practice reading articles and highlighting the key points on a piece of paper, like a brief synopsis and then presenting it to a friend/parents…?
Hope this helps and best of luck with your AC!