@trm90: thank you so much!! that was such a detailed answer...I am finding that my biggest problem is understanding the question. Most questions, if you look closely, have two meanings, one really obvious one, and one that is not so obvious. I tend to notice the not so obvious one...meaning that i basically misunderstand the question.
Another problem that I seem to have - if you can call it a problem - is that usually when I answer a question and get a bad mark, and then look at the criterion, I feel that I have mentioned everything in the marking scheme - I therefore assume that my teacher just doesn't understand what I write...but then I have the problem of if the marker doesn't understand me. If you wondering how my english is, I'm getting a 7 in Eng HL, and am predicted >90%