I also noticed that all of the visible 3-star submissions (the finalists) contain grammar errors (example: "A research states...") and syntax problems (example: "...they are more likely to go towards the comfort of junk food."). But the biggest problem with them is irrelevant content: Water and sleep are not helpful exam foods. Readers who expect an article to stay on topic will be annoyed.
Dear Contest Holder -- I wrote my submission according to all the specified requirements. I included a bit of "folklore, or story," but it wasn't the centerpiece of the article, just an attention grabber relevant to the topic. My main content is focused on the claim that healthy foods help students perform better.