Yes, I can see how that would be beneficial. I have actually seen an example of that at my son's school. Each month they take a reading achievement test and are then given their results to plot on a graph in their folder. They are told not to share their results with others.

It was only partly effective in my son's case though as he noticed that one of his classmates had to add to his graph because it only goes up to 300 and he scored higher than that. My son's last score was a 297 and he told me that he wants to go over 300 so he can add to his graph too. Some kids are naturally competitive and I don't think that's necessarily a bad thing. I do think it's good for that to not be the primary focus though.