How about education in terms of social class?
There are so many research ideas based on this. In a book 'Schooling the Smash Street Kids' by Corrigan, in his final chapter, he brings in thoughts from different perspectives (Left and Right Wing) to then take on a Marxist perspective whilst applying his research findings, to propose ideas to change 'actions' of youths within education. He provides different explanations to other theorists on why kids play 'truant' and why the misbehave both in class and on the streets, linking both together. It is based around the state using the authority figures such as teachers and the police to use their 'power' over youths. I think he is highly influenced by Marxism.
Or another approach to look at educational achievement in terms of social class.