First of all, I do not think that the makers of the mcat purposely shy away from using "C" as an answer on the last passages because they think people running out of time will guess "C". Therefore, the comment that you can only expect to get at most %25 correct is ridiculous. You can expect to get, on average, %25 of those right. Which means you probably got a little bit more than 25% or a little MORE than %25.

Now, as for you question, is it still possible to get a 10? I have a feeling this the following is going to make you feel a lot better. I don't know how many questions there were in the last column, but suppose there were 20, and suppose that you got %25 of those correct. It is still possible for you to get a solid 15!! That's right. You can get 62 out of 77 and still get a 15! This is only on average, and will of course differ from test to test, but that is approximately correct. So if you got all the other questions right, then you're all set.

Hope this helps.

David