1. More content, the better. There's always more facts you can memorize for the biology portion. Stand-alones need to be money, so memorizing all those hormones, digestive enzymes, and weird quirky things your content books tell you to know will go a long way.
2. Knowing when to use the facts you know or the passage. This is the toughest part. You need to really get into using the passage. It seems that you're not comfortable doing that. Good rule of thumb - if you can answer it with the passage, answer it with the passage. Sometimes they fling exceptions at you, and if you followed your outside knowledge, you'd get the question wrong. Get used to weird approaches to things you already know.
3. Organic needs to be CAKE. The only way they should be able to steal right answers from you is with hard, obscure bio. You have to be getting all (if not most) of the Organic correct. MCAT Organic is comparatively easier than what you learned in Organic I & II, so it's not outside your abilities.
4. Have extra time!!! I wouldn't have gotten a 14 on the BS section on the real thing if I didn't have extra time to debate myself on those really hard questions. Double-checking is very important. You may not even be making stupid answers and double-checking can still help you. How much time do you usually have left over?
The Biology section is all about style. People go into their MCAT studying thinking "oh, well that'll be the easiest section for me cause I'm a bio major" and get destroyed because it's a hard, hard section. But it's a section that reaps great reward if you can get it to "click".
By the way, an 11 is great. So if you get an 11 on the real thing don't be disappointed.