The Academic Performance Index (API) is an annual measure of test score performance of schools and districts. (ed-data.org)
Not only does the game keep a record of high score performances, but it also rewards you with special virtual «scratch tickets» when you complete a match / event. (cogconnected.com)
There is a gap in test score performance between students who score high on this index and students who score relatively low on it in every country in the world. (34justice.com)