Whether you want that or not depends on what you're trying to achieve. China has pursued basically the approach you're talking about: focusing on key province to advance them to the cutting edge. The last time China participated international high-school testing, they published scores only four Beijing and three other wealthy provinces: https://www.milkenreview.org/articles/are-chinas-students-re.... And those scores were spectacular! Clearly that approach has some merit if your concern is competing with other countries rather than domestic equity.