HOW HARD IS THE AP MIDTERM? Anyone!?

i'm a sopre taking the AP Biology midterm tommorow. I studied and I have a pretty good understanding of the context. The review guide she gave us consisted of Meiosis, Mitosis, Photosynthesis, Cell Respiration, Osmosis and Diffusion, Cell Membranes and signal transduction pathways, Proteins and enzymes. Was it extremely difficult for those of you that took it. I know that it is different every year but I can';t imagine the difficulty level has changed. I got a 90 in it firstterm so I know my stuff and i'm not a slacker, i'm just kind of worried.