If you are not sure how to sell yourself, you should read the information offered on the website before doing this exercise. Be aware that you have to click on all correct answers before checking if you answered the question correctly. Moreover, the results will only be transferred after you have checked each question.
You should know a lot about the company you apply for because
Why should you study the description of the job in detail?
Why should one analyse one's strengths before going to a job interview?