The summary should be prepared for each specific position and must be considered as a tool to highlight your skills and attract the attention of human resources professionals, with whom later to a private communication during the interview. There are plenty of websites and literature on the preparation of cover letters and resumes. You can also apply to a number of books, which contain recommendations on how to behave at the interview and prepare for the difficult issues with which you will encounter. So bad in front of each interview, review such literature, to be mentally prepared.