It is a jump in English literature but with practice it becomes a lot easier. It is hard for everyone at first trust me. Literally every single person in my class got Ds and Cs in their first English literature exams for A level despite all of us getting between 7-9 at GCSE. Now at the end of year everyone has improved so much. If you work hard and listen to teachers feedback it becomes a lot easier to improve.
Both of the subjects seem really interesting, I didn’t know they did A level law, I’m sure it would look really good if you apply for uni. Have you looked at what you would learn for law A level?
History is a lot of content but if you enjoy history as a subject it is a lot easier. People do find it hard but I don’t think that it was that big of a jump for GCSE. Honestly, I do think it’s just a lot more content and detail to learn but it is do able if you keep on top of it. Also the questions are more broad and you have to think of the paragraphs yourself but it becomes much easier as you go along. Do you know which topics they would cover? I looked at different schools and based my choice of sixth form partially on the history topics that I thought would interest me the most.
Also a side note for history there is coursework. Which is around 20% I think so that would help if you aren’t as confident with exams. Its also the same with English actually, there also 20% coursework to boost your grade.