Is there any thing I should do after the interview?
Analyze the interview. Start by asking yourself how the interview went. This will likely not be your last interview ever so you can use that experience to enhance your interviewing skills. It is also important to reflect upon the new information you learned about the position and the organization, as well as what your impressions were of the organization and the interviewer(s). Keep a written record of each interview to help you remember and compare positions later.
An individual thank you note should be written to each person that you interacted with during the interview process. Use this opportunity to reiterate your specific interest in the position and your strongest qualifications.