One of the first common errors that people make occurs even before the interview begins. This is to put on their best suit. This is just about the last things that you want to do because it will make the interviewer think that you are a snob. Know who you are and be yourself. Instead of dressing up, wear clothes like what you are wearing at class or around the house. Remember, interviewing is just like going on a date, so relax and enjoy.

Be sure that you arrive fashionably late……you don’t want them to think that you’re desperate.

And then, one of the first things that you’ll want to bring up in your interview is salary because if they aren’t willing to give you enough money, there’s no reason to waste everyone’s time with the interview. We live in a busy world and time is money.

When you are asked a question, don’t worry about exactly what they ask, just give a pre-fabricated answer because they really just want you to talk. Remember that the interview is about you and don’t let the interviewer talk too much.

Not to sound very cliché, but first impression lasts way longer than your first sentence especially if you are going for a job interview. We all ask ourselves if our clothes really make a difference when we know for sure that we are the right candidate for the applied job.  The answer is an emphatic ‘yes’, since the first impression you make on the interviewer is going be an important factor in deciding whether or not you will get the job. People often neglect their outlook when going for an interview, as they do not realize the importance of dressing and the overall outlook in impressing the interviewer. While there is no doubt that your qualification, skills and education are the primary assets that help in getting the required job, it is also true that the way you dress up for an interview will heavily affect your chances of getting the job.

Great interviews arise from careful groundwork. You can ace your next interview if you:

1. Enter into a state of relaxed concentration. This is the state from which great basketball players or Olympic skaters operate. You'll need to quiet the negative self chatter in your head through meditation or visualization prior to sitting down in the meeting. You'll focus on the present moment and will be less apt to experience lapses in concentration, nervousness, self-doubt and self-condemnation. 
2. Act spontaneous, but be well prepared. Be your authentic self, professional yet real. Engage in true conversation with your interviewer, resting on the preparation you did prior to coming to the meeting. Conduct several trial runs with another person simulating the interview before it actually occurs. It's the same as anticipating the questions you'll be asked on a final exam. 
3. Set goals for the interview. It is your job to leave the meeting feeling secure that the interviewer knows as much as he or she possibly can about your skills, abilities, experience and achievements. If you sense there are misconceptions, clear them up before leaving. If the interviewer doesn't get around to asking you important questions, pose them yourself (diplomatically) and answer them. Don't leave the meeting without getting your own questions answered so that you have a clear idea of what you would be getting yourself into. If possible, try to get further interviews, especially with other key players. 
4. Know the question behind the question. Ultimately, every question boils down to, "Why should we hire you?" Be sure you answer that completely. If there is a question about your meeting deadlines, consider whether the interviewer is probing delicately about your personal life, careful not to ask you whether your family responsibilities will interfere with your work. Find away to address fears if you sense they are present. 
5. Follow up with an effective "thank you" letter. Don't write this letter lightly. It is another opportunity to market yourself. Find some areas discussed in the meeting and expand upon them in your letter. Writing a letter after a meeting is a very minimum. Standing out among the other candidates will occur if you thoughtfully consider this follow up letter as an additional interview in which you get to do all the talking. Propose useful ideas that demonstrate your added value to the team. 
6. Consider the interviewer's agenda. Much is on the shoulders of the interviewer. He or she has the responsibility of hiring the right candidate. Your ability to do the job will need to be justified. "Are there additional pluses here?" "Will this person fit the culture of this organization?" These as well as other questions will be heavily on the interviewer's mind. Find ways to demonstrate your qualities above and beyond just doing the job. 
7. Expect to answer the question, "Tell me about yourself." This is a pet question of prepared and even unprepared interviewers. Everything you include should answer the question, "Why should we hire you?" Carefully prepare your answer to include examples of achievements from your work life that closely match the elements of the job before you. Obviously, you'll want to know as much about the job description as you can before you respond to the question. 
8. Watch those nonverbal clues. Experts estimate that words express only 30% to 35% of what people actually communicate; facial expressions and body movements and actions convey the rest. Make and keep eye contact. Walk and sit with a confident air. Lean toward an interviewer to show interest and enthusiasm. Speak with a well-modulated voice that supports appropriate excitement for the opportunity before you. 
9. Be smart about money questions. Don't fall into the trap of telling the interviewer your financial expectations. You may be asking for too little or too much money and in each case ruin your chances of being offered the job. Instead, ask what salary range the job falls in. Attempt to postpone a money discussion until you have a better understanding of the scope of responsibilities of the job. 
10. Don't hang out your dirty laundry. Be careful not to bare your soul and tell tales that are inappropriate or beyond the scope of the interview. State your previous experience in the most positive terms. Even if you disagreed with a former employer, express your enthusiasm for earlier situations as much as you can. Whenever you speak negatively about another person or situation in which you were directly involved, you run the risk (early in the relationship) of appearing like a troubled person who may have difficulty working with others.