Essays / In-class essays--how to improve on them? [6]

Hello, EssayForum.

I have a problem: I'm horrible. horrible, horrible on in-class essays, The limited time prevents me from any insightful commentary; plus, I have no time for revision. That is a huge issue since I believe editing is an essential component to writing good essay (for me anyways).

I am sure of my ability to write. I get high 90's for at-home essays, whereas 70's on in-class ones. How do I change this? Do I write more practice essays with a timeline? How did you improve --if you did?

Thank you very much.