Systems like this are not new. When I was in elementary school in the US Midwest, we had a program called accelerated reader, (AR), where you could take tests about books and get points. The longer the book, the more the points. You could redeem the points for candy.

Anyway I was banned from AR in the 5th grade because I learned you could sort the book list by points awarded, so I wrote down the list of most valuable books and checked them out from the library. I convinced a 2 friends to help, one would take the test and write down the questions and then someone else would read the book to get the answers and share them. We ended up racking up like way more points than anyone else and the teachers called out and made us explain.