Just to say about the AQA marking for English Literaturw - different exam boards make different papers and have different styles of question, different texts sometimes (although similar) and they have different mark scheme based on different AOS (assesments objectives - what you need to do in your answers. AQA English Lit has A01 - knowledge and structure and ideas mainly being coherent, etc. AO2 - Language and structure analysis and evaluation, etc. AO3 - Context of the author and the time the book was written, etc, and using that to inform your AO1 and AO2. That's a brief summary.
Basically, for any subject but especially English Lit, you can not compare the marking because the papers, the questions, what they ask students to do, the structure of the paper, etc, are all different. So while there may be 'issues' with marking that happens across all subjects(it may also not be an issues of marking but the student messed up, read the questions wrong, pressure, ran out of time etc). So it's quite hard to make a comparison of marking across exam boards, especially for English literature, as its so different between them. If you think the mark is wrong or bizarre , ask the school exam officer to request the scripts and teachers to review first before you go for a review of marking.