I wouldn't recommend it, because chemistry gets a lot better after about a month - well it did for me. Because I wasn't getting anything in class I went home and studied what we had learnt, and even asked the teacher what we were doing next lesson, so that I could read ahead. You don't need to do this much right away, but once chemistry clicks it's not so bad. Also worth mentioning that I have many friends who take history and they are always complaining about the essays and workload!
EDIT: I also highly recommended physics and maths tutor for chemistry revision! And the CGP chemistry student guide is brilliant too!