I can only speak about my approach based upon my experience. The writing exercise is mainly to write a summary from the information given. From my understandinig, it is more about your formal writing style, such as, the lay-out. Of course, you need to find out the useful information from the package and simply ignore the rest (which would probably be most of them). I am not a native-speaker and I believe I did quite OK. Thus, I don't think you need to worry about the gram. or the spelling. Just go out there doing your best and good luck! :-)