Hello Janaki,
As Rashid had guided you very properly in terms of how to preeare nad other had given you all the tips for documents. Let me added suggestions only.
1. Always carry a Writting pad, so that if interviewer asks you to make some notes, or workout something, you should be ready to action.
2. Carry your Passport size photo, atleast 2. Sometimes it required in some companies.
3. DONT FORGET TO CARRY YOUR CONFIDENCE...........THIS IS THE MOST IMP THING.4. IF you have work exp. then carry the supporting documents, (like experience certificate, appriciation letter, salary slip copy)
5. If you are fresher, then carry your project copy (if it is in the alingment with the job profile), it will help you to present your candidature to interviewer. it gives a idea about your working pattern.
6. Be ready with your SWOT Analysis. it is useful for presenting your complete profile, when the question is asked "Tell me about yourself?". DOnt use weakness word rather use it as areas of improvement. this shows how much you are aware of self and learning atitude.
SEE the PPT attached herewith this will give you more ideas.
BEST OF LUCK>>>>>>>>