<prompt> Translate the following text to EnglishYeye anaelezea kwa mara ya kwanza jinsi utaratibu wa uteuzi kwa ajili ya darasa elimu - SAT - alikuja kuchukua jukumu lake la sasa kutawala.  <response>: He tells for the first time how the selective mechanism for the educated class--the SAT--came to occupy its current dominant role. 