This is currently not possible on-site. However it might be possible using a Google Document and importing their points from their userpages assuming the "people" you are trying to rank are ONLY studying that individual course.
I'm not entirely sure how importing works on Google Docs. I'd have to fiddle around with it myself to see if it is possible to extract the points from Memrise. I know it's possible with other data from other websites as I use such documents from time to time... but I don't know the finer details.