For your first few interviews your background is important - your school, the medium and the place you studied in, all serve to give the interviewer an idea about you. Carry a copy of the bio-data that you have already sent, and the interview letter. Keep the extra copy with you, just in case. Show the interview letter to the receptionist/interviewer to establish your credentials, but keep this letter with you. This gives you, for your future reference, a time and date record of your interview, gives the official address of the company for further correspondence and clarifications, and may give you the name and designation of the person you are to report to.

Carry everything you need for the interview in a neat folder - do not have loose papers cascading to the floor because you are desperately hunting for the degree certificate, while the interviewers drum their fingers impatiently. And don't carry your papers in a plastic or cloth shopping bag either: invest in a good folder, plastic or even leather.

Incidentally, don't feel shy or hesitant about calling up the office and getting details about location, landmarks/bus routes/other information to help you reach the venue of the interview. Again, if it is not a "mass" interview, where lots of people are being interviewed on the same day, and you do have a genuine difficulty about reaching on the scheduled day/time, many employers will re-schedule if you ask them nicely enough. The reverse is also true: a good impression is created if you take the trouble to inform the interviewer that you can/will not attend the interview. If you are in the same town go and "case the joint" - see where the office/interview center is, and how long it will take you to get there.

Always arrive at least fifteen minutes before your scheduled time - that gives you time to catch your breath in case you climbed the stairs too fast, allows you to compose yourself and not be too nervous, and to check out the competition. If the interview is in the offices of the company itself, this also allows you to get a "feel" of the company. See how comfortable you feel, how efficient the interview process is. Says a lot about what the rest of the company is.