I took WJEC English Lit all the way to A2 and OCR History to A2 too.
I found the change in English to be more noticeable in class: the amount of people in the lessons went down from 30 to 13, plus some dropouts later in the year. I found that, with English, there was a lot more independence expected which I enjoyed. However, it was clearly not suited for some of my classmates and I can't tell you how annoying it was at A2 to still have people in the class who had decided not to read the text two weeks before exam time or who didn't manage their time well enough and then asked for extensions on coursework. I questioned every day why these people even took the class.
The coursework for WJEC is obviously much bigger, both at AS and A2, you are almost immediately expected to start writing essays. One plus I can give for AS was that one side of our coursework was a creative piece based on a novel you were reading (this was awesome, getting creative tasks is so rare!). I found the AS poetry excruciatingly boring but my best friend in the same class thought it was amazing, so I think that's just taste in texts.
At A2, the biggest and most important thing for me was that with WJEC in A2 no texts are allowed in the exam hall. This sounds terrifying, but it is not! You DO NOT have to memorise every single line of the play and poetry (Shakespeare and Blake in my case) but you do have to start early with focusing on some key lines that can be applied to several questions.
History: I was with OCR for History, and at AS found that you had to know a lot of content, way more than ever expected of me, but with proper focus in lessons, you can grasp the dates and stuff, just keep going over it and over it. With AS as well, the exam questions were repeated so if you became familiar enough and did enough practise essays you could almost recycle one when it came to the exam. As for A2, I had a complete change of heart and loved it. A2 OCR was 100% assessment with no formal exam. There was a personal research project of your choice (within reason) and the other half was Nazi Germany and unlike AS where I didn't quite see where everything related, I could see how both the skills in the personal research project and the ones needed for the Nazi course intertwined.
I don't know if this is helpful because I am 99% sure that exam boards all operate way differently, but this was my experience.