So winner takes all, essentially. So low testing schools, which are generally more poor fall even further behind. Wow.
Also, this reminds me of Goodhart's law.
Goodhart's law is an adage that has been stated as, "When a measure becomes a target, it ceases to be a good measure".[1] It is named after British economist Charles Goodhart, who is credited with expressing the core idea of the adage in a 1975 article on monetary policy in the United Kingdom:[2]