First impressions are pretty important (Primacy effect).
So make sure you are appropriately dressed, well-groomed, and enter the room with a smile and a pleasing countenance.
So is the final impression. (Recency effect)
Make sure you end the interview on a good note. Do your homework when it comes to the role you are applying for, the company profile, the industry outlook and future trajectory.
Most interviews end with the interviewer soliciting questions from the candidate. Try and ask something relevant and interesting.
Get some sleep the night before.
You want to be well-rested and fully awake the next day. Lack of sleep would mean you are a little foggy, grumpy, and not performing at your best.
Nobody expects you to be perfect and all-knowing. If you do not know something, admit it. It is better than beating-around-the-bush and trying to cover up, which almost never works. And if you get caught bluffing, it's a sure shot way of getting rejected.
Some people try to be nicer. Some try to be more professional. And it backfires a lot of time. You can either come across as a suck-up, or downright rude. Also, if you are not preoccupied with the pretense you are putting up, you can focus more on the things that actually matter.
Clean up your social media footprint.
A lot of interviewers have started doing background research on candidates by going through their social media profiles.
Make sure that your Linkedin profile is updated, there are no objectionable photos on your Instagram account, your retarded, inflammatory, or plain ignorant Facebook posts.
Make sure your resume is updated.
If the latest item on your resume is something you did more than a year ago, you will come across as either incompetent or just too lazy to even update your profile.
Arrive on time.
Don't think, "It's just a 15-minute ride. I will start 20 minutes early". Start an hour before instead. Make sure you have factored in any chance unfortunate incidents like an unlikely jam, an accident, the cab breaking down, not being able to find the office or the exact interview location.
Also, if you arrive decently early, you have time to do a sanity check. Wash your face, comb your hair, check your documents, be mentally prepared. Make sure your "interview persona" takes over as soon as you enter the company premises. Be polite to everyone starting including the security guard and receptionist. You never know who else is there in the waiting area.
Treat it like a date.
Make it an interesting conversation rather than a terrifying interrogation. After all, you are there not only for the interviewer to judge your competency, but also for you to evaluate whether the profile, the team, and the company culture is in sync with your personality.
A wonderful article/series of illustrations on Lifehacker does a good job of explaining the basic etiquette to be followed before, during, and after an interview.
Interview Objective: Join the 180° Club
What You Hopefully Did Months Ago
Because I GUARANTEE This Will Happen Before Your Interview
What You Should Do Leading Up to the Interview
What You Should Bring
This is Not a Party
"Fashionably Late" Does Not Exist
How Enthusiastic You Should Appear
Question Category Overview: What I (the Interviewer) am Really Trying to Figure Out
Tell Me About Yourself
What are Your Strengths?
What are Your Weaknesses?
Describe a Time You Had Difficulty Working with a Coworker.
What Was Your Biggest Mistake?
Describe Your Ideal Workplace
What Do You Know About this Company?
Why do You Want this Job?
Do You Have Any Questions for Me?
Lunch: Price Considerations
Lunch: Limit Your Pickiness
Lunch: Appropriate BAC Level
Lunch: Very Important Additional Consideration
What to Remember Regarding a Thank You Email
P.P.S. Here's a website listing the FAQs in interviews and how to tackle them
- Question 1 Tell me about yourself.
- Question 2 What are your greatest strengths?
- Question 3 What are your greatest weaknesses?
- Question 4 Tell me about something you did – or failed to do – that you now feel a little ashamed of.
- Question 5 Why are you leaving (or did you leave) this position?
- Question 6 The "Silent Treatment"
- Question 7 Why should I hire you?
- Question 8 Aren't you overqualified for this position?
- Question 9 Where do you see yourself five years from now?
- Question 10 Describe your ideal company, location and job.
- Question 11 Why do you want to work at our company?
- Question 12 What are your career options right now?
- Question 13 Why have you been out of work so long?
- Question 14 Tell me honestly about the strong points and weak points of your boss (company, management team, etc.)…
- Question 15 What good books have you read lately?
- Question 16 Tell me about a situation when your work was criticized.
- Question 17 What are your outside interests?
- Question 18 The "Fatal Flaw" question
- Question 19 How do you feel about reporting to a younger person (minority, woman, etc)?
- Question 20 On confidential matters…
- Question 21 Would you lie for the company?
- Question 22 Looking back, what would you do differently in your life?
- Question 23 Could you have done better in your last job?
- Question 24 Can you work under pressure?
- Question 25 What makes you angry?
- Question 26 Why aren't you earning more money at this stage of your career?
- Question 27 Who has inspired you in your life and why?
- Question 28 What was the toughest decision you ever had to make?
- Question 29 Tell me about the most boring job you've ever had.
- Question 30 Have you been absent from work more than a few days in any previous position?
- Question 31 What changes would you make if you came on board?
- Question 32 I'm concerned that you don't have as much experience as we'd like in…
- Question 33 How do you feel about working nights and weekends?
- Question 34 Are you willing to relocate or travel?
- Question 35 Do you have the stomach to fire people? Have you had experience firing many people?
- Question 36 Why have you had so many jobs?
- Question 37 What do you see as the proper role/mission of…
- Question 38 What would you say to your boss if he's crazy about an idea, but you think it stinks?
- Question 39 How could you have improved your career progress?
- Question 40 What would you do if a fellow executive on your own corporate level wasn't pulling his/her weight…and this was hurting your department?
- Question 41 You've been with your firm a long time. Won't it be hard switching to a new company?
- Question 42 May I contact your present employer for a reference?
- Question 43 Give me an example of your creativity (analytical skill…managing ability, etc.)
- Question 44 Where could you use some improvement?
- Question 45 What do you worry about?
- Question 46 How many hours a week do you normally work?
- Question 47 What's the most difficult part of being a (job title)?
- Question 48 The "Hypothetical Problem"
- Question 49 What was the toughest challenge you've ever faced?
- Question 50 Have you consider starting your own business?
- Question 51 What are your goals?
- Question 52 What do you for when you hire people?
- Question 53 Sell me this stapler…(this pencil…this clock…or some other object on interviewer's desk).
- Question 54 "The Salary Question" – How much money do you want?
- Question 55 The Illegal Question
- Question 56 The "Secret" Illegal Question
- Question 57 What was the toughest part of your last job?
- Question 58 How do you define success…and how do you measure up to your own definition?
- Question 59 "The Opinion Question" – What do you think about …Abortion…The President…The Death Penalty…(or any other controversial subject)?
- Question 60 If you won $10 million lottery, would you still work?
- Question 61 Looking back on your last position, have you done your best work?
- Question 62 Why should I hire you from the outside when I could promote someone from within?
- Question 63 Tell me something negative you've heard about our company…
- Question 64 On a scale of one to ten, rate me as an interviewer.