Job interviews can be tricky to negotiate, especially if the interviewer is devious. Let me offer this simple and unsolicited advice. There are three things an employer must know about you - maybe four - if they want to attain a comfort level commensurate to the job you want. ONE: are you smart? TWO: are you motivated? THREE: can you work well with others?
The first is essential because you might be very willing to work hard but if you can't learn what they have to teach you, and can't contribute new things to the enterprise, then you might as well go home. The second? Well, you might be a genius but if you are not driven to accomplish, then you too, will be sent home. Thirdly, you might be smart and motivated but maybe you have a problem working with others courteously, collegially, and cooperatively. Go home. Perhaps the fourth thing is honesty. Many employers nowadays pull credit reports on prospective employees to see if there is a financial problem somewhere - it's an indicator of sorts. If you know that to be the case, cleaning your credit profile should be a priority.
Knowing this, how do you make a good impression? Be composed (relax), exhibit as much confidence as you can (without appearing cocky), and be as convincing as possible - speak with conviction (sincerely). Make believe you're talking to someone who already knows everything about you - do not put up a front. Visit websites that list the most common interview questions and learn the answers that apply in your case. I hope I haven't left anything out. Best wishes.