Preparing for the interview is the best way to improve your chances of landing the job. When you’re well-prepared, you’ll be calmer, and you’ll enjoy the process more. When you’re calmer, you’ll do better.
Preparing for the interview also means that you will look like you prepared for the interview. When you’re fumbling for answers or paperwork in the interview seat, it leaves a bad impression with the interviewer.
Finally, after you’ve read the next chapter, Chapter 8, The Interview, come back and revisit this chapter in light of any new ideas you pick up from there. That chapter and this go hand in hand.