G-GOLF, I am also thinking that the verbal part was way easier than the maths part.
I suppose that it was intentionally designed in such a way, to check how a candidate cope under stress (in this case - very narrow time constrains) and I don't think that completing only part of the math questions will exclude You from the further recruitment process.
I am also wondering, if the best strategy (as seen by the person reviewing the results) is to complete the questions in correct order, or just skipping those questions on which You got stuck at some point (as I did), in order to use as many time as possible for other, potentially easier questions. What do You think about it?