i just took 11 because i wanted to see just how bad it was. it was really pretty ridiculous. the PS was completely insane. studying any type of general chemistry or physics would not even help. i have no idea what the purpose of that exam was. verbal was also very hard. even going over the questions afterwards i am like what? take 10 and let me know how it goes.
just dont take it too seriously. i have taken aamc 3-7 and kaplan 1-5 and done really well on all of them. this test kicked me in the face. but i asked for it i guess.