I'm having problems with my timed essays

I'm having problems with my timed essays for English Lit. A lot of them are to do with having a bad structure to them and not picking up marks with what I'm saying. What I write tends to not be corresponding to the marks in the mark scheme. Thing is, when I write, I just tend to write and write that I kinda just let my ideas all loose onto the paper and it just ends up failing on me.



I'd just like your tips on improving my English Lit essays in accordance to getting high marks and how to properly write and structure an essay.