As far as the English goes, I'd like to add that the recordings are made in standard "school/Queen" English. No dialects, strange accents, weird slang words or any such thing. Just nice English.
The only point really is if you understand the meaning of the story, i.e. if you are able to draw logical conclusions from in or reproduce information provided.
As far as I remember, there were two parts to this. In the first part the stories were very general in their theme (people driving cars, going shopping etc.) and the questions were more of a logical nature (if you understand negatives correctly, if you can evaluate conditions...)
The second part consisted of longer stories, aviation related (e.g. meteo phenomena) and the task was aimed on if you remember enough.
At least that is how I remember it. Overall, my impression was that if you speak decent English, there is no reason for not having 100% here.