My advice would be to be conscious of the fact that you're taking a test for a potential employer, and answer the questions with the answer that regards the trait that an employer would want the most in an employee.
Some of the questions are kind of like this....
With 1 being Strongly Disagree, and 5 being Strongly Agree, and 3 being Neutral, rate how you think the following describe your personality:
I am lazy 1_ 2_ 3_ 4_ 5_
I always finish tasks well before I need to 1_ 2_ 3_ 4_ 5_
I tend to get along with others 1_ 2_ 3_ 4_ 5_
etc.
A lot of the questions are really obvious ones like that as to what answer the employer is really looking for, and a lot of questions are just the same questions put into different words.
I wouldn't really stress about the web interview, just answer the questions with "strongly agree" or "strongly disagree" most of the time instead of using the more neutral options, and try to remember you're taking the test for someone who is going to hire you to work for them. The phone interview is where they really end up determining if they are going to accept you or not anyways.