I don't think test scores are a predictor of success, but I do think they are one of the best metrics we have, and actually help poor kids to "make it" to good

I don't think test scores are a predictor of success, but I do think they are one of the best metrics we have, and actually help poor kids to "make it" to good schools. Rich kids might have access to better teachers, but Math is the same for everyone, a poor kids using materials freely available in a public library can do very well in exams, allowing him to get into an elite school, otherwise only reserved for the elites.