I understand what your saying, this totally happened to me when I took practice tests before the MCAT. The highest I could get was about 22, and I did worse then that on the real thing. Your Bio sections seem to be pretty consistent, but your verbal and physics sections seem to be varying. I think you should practice alot on the verbal section. The first time I took the MCAT I got a 6 in Verbal, but then I practiced like 2 hours a day with verbal passages and I got an 8 on the real thing. Also with Physics/chemistry you may have to go back and relearn some of it to get more confident in the answers you are picking. This time around I am going to relearn all of the Physics and chemistry as if I have never seen it before. It sucks starting from scratch, but it will be worth it when you get your score back. Good Luck!