I think the number one way to prepare for an interview is to practice answering questions. I think this is the most important for me because I have been in situations where I have went into an interview confident thinking I was ready and when they asked me questions I got stuck and couldn't think of answer. I feel like if I practice what I'm going to say ahead of time I can just remember my answers and not have to think so hard. Also it will give me more confidence and I can focus on other things such as eye contact and posture. 2) You should not bring your cellphone or food and drinks to an interview. Bringing your phone to an interview can be a distraction and food and drinks can cause a mess and it's not polite to eat and talk/chew gum anyway. 3) It is very important to ask questions during an interview because it shows that you are interested and engaged with the company. I would ask questions like "are there opportunity for growth within the company", or "where do you see the company in 5 years