One advantage of the interview method of personality assessment is the ease of interpreting responses ability to respond anonymously ability to pose open-ended questions

One advantage to the interview method of personality assessment is the ability to pose open-ended questions. 

Analysts look to quantify personalitythrough various strategies, the most widely recognized of which are target tests and projective measures. Target tests, for example, self-report measures, depend on a person's close to home reactions and are moderately free of rater inclination.

Basically create a schedule on what you need to study and stick with it