Almost everyone take English Literature at state schools as the way Attainment 8 and Progress 8 scores are calculated (which are the main statistics used by the government to rank schools) massively incentivises it. This has been the case for the past 5 or so years. Strictly speaking, there are no compulsory GCSEs but a combination of common sense and the need to look good in league tables mean that most people do a set of core subjects.