This is similar to what Water said:
I did unit 1 Lit, hated it, and moved to English for unit 2.
Biggest thing that brought me down after the swap was, sadly enough, basic essay structure.
In Lit were were taught the "literature style" of essays... you would know, it is a fair bit more sophisticated and less formally rigid. However, you need to remember to simplify your essay structure down. You NEED an obvious introduction, body paragraphs with clear topic sentences and links, and a clear conclusion WHICH SUMMARISES YOUR ESSAY AND DOES NOT INCLUDE NEW INFORMATION.
You probably already know that, but in Lit you get lazy with structure, as they are generally not as strict.
So I guess take a step back with essays... obviously not year 7-level lame structuring ... but keep it logically ordered and simplified in structure.
That said, use your lit advantage. Coming out of even one semester, I found that I was able to analyse texts, and even persuasive techniques, on a level slightly different to the people in my class (I was the only one who had come out of lit).
So go as deep as you can, like in Lit, but remember to structure your essays differently.
Hope that helped a little bit... do you know what you are struggling with in particular??