My advice is to be honest and consistent. If you answer how you think they want you to answer, it'll "flag" your responses as if you're lying, so just be truthful. That will benefit you also, because it is a test also for how you will fit in with the company. If you give false answers, you might find that the job isn't the best fit for you anyway.
Also be consistent! Be careful of reverse questions or questions/statements that say the same thing in different ways. One question might say "I prefer to work on a team" and another might say "I prefer to work alone" so if you answer "strongly agree" to both, you're contradicting yourself. However, with that being said, if you're honest in your responses, you shouldn't have much of a problem.
I have also heard that it's better to have strong stances on items rather than answering with too many "neutral" or "don't know" selections, but that could just be a wives tale. It might be useful to look into the company culture before taking the exam also, because the questions might reflect that culture. For example, when I took the test for Nordstrom, it was mostly about customer service. Knowing that Nordstrom is very customer focused, I made sure to emphasize my dedication to taking care of the customer.
Hope that helps, good luck!