I think, and have thought for some time, that this quiz is a little unfair. The questions seem to compel people towards offering answers which are to the left. How is it possible to agree with a question which reads "Multinational corporations should put profits before the environment"??
Also, I rather disagree with the test's definition of precisely where the centre is. The compass assumes a static centre, yet is a centre really defined as a specific set of policies, to which you can be located towards the left or right, or is it more of a fluid concept, prone to change over time as the opinion of the mass electorate changes? Is being on the right today the same as it was in the 1960s, for example? Roy Hattersley was considered to be on the Labour Party's right in the 1970s, by 1988 he had moved distinctly to the party's centre, and now he is considered to sit to its left. His policies haven't changed dramatically - representing a fairly unrevised blend of Croslandite social democracy - yet the centre of the Labour Party has moved around him.
Thus, I don't think its necessarily that easy to place someone on the political compass without first having a worked out definition of precisely where the 'centre' lies.
So there!