you are a genius! i dont know about the mark you would get but this was so enjoyable to read (not implying you will get a low mark but rather the opposite).
i especially loved the "Clique, clique, clique goes the camera".
The story has a decent plot line which has potential in an exam but you might want to shorten the story and i know it's really hard to write a descriptive story with so few words but you couldn't possibly write all of that in the exam.
Another thing i think you can work on is introducing the...