Hello,
First of all, take care of your personality and appearance, remember first impression is last impression. Groom yourself before placement process, break your beard, Cut your Nails and avoid having Long hairs. Now, it is very important for you to have good knowledge about the background and a last few years of Performance of the company (also memorize the names of CEO and founder of the company).
Even if your marks are little lower as compared to other candidates, you must be having full knowledge about your relevant field. Don't smile all the times, a little smile while answering the recruiter would be enough.
Don't laugh. If you don't know the answer then just say, I don't have any idea about it, sir. Avoid being too rude or too friendly with the recruiter, keep everything like a professional person. Remember, Don't get aggressive while negotiating the salary. One more thing, carry two resumes with you along with all the mandatory documents.
Good luck.
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