Yeah I scored the same on ochem and gen chem portions but had a 19 in bio.
I went over the test and found at least three questions where I should have known the answer but didn't read it carefully. This probably would have put me up in the 17~18 range.
My advice is to look over the questions and see why you got them wrong. I bet you probably didnt read it too carefully.
Also, when I took the organic portion I didn't keep up with my studying of reactions b/c I didnt touch ochem for a week and a half. So for me I now know that I need to at least go through the reactions every other day.
Just relax, you have time to fix your mistakes. One more thing, have you made a study guide for bio? If not, you should, I also found that for me I need to at least memorize some of the main concepts and not rely on just reading through cliffs AP.