A lot of people have failed to secure thier dream job because of bad cv.
So many people who are not worth have been employed because of thier cv. Your cv is a very good tool you need at first.

Know this at first:

Question: Curriculum Vitae vs. Resume?
What is the difference between a curriculum vitae (CV) and a resume?

Answer: The primary differences between a resume and a curriculum vitae (CV) are the length, what is included and what each is used for. A resume is a one or two page summary of your skills, experience and education. While a resume is brief and concise - no more than a page or two, a Curriculum Vitae is a longer (at least two page) and more detailed synopsis.A Curriculum Vitae includes a summary of your educational and academic backgrounds as well as teaching and research experience, publications, presentations, awards, honors, affiliations and other details. In Europe, the Middle East, Africa, or Asia, employers may expect to receive a curriculum vitae.In the United States, a curriculum vitae is used primarily when applying for academic, education, scientific or research positions. It is also applicable when applying for fellowships or grants.

http://jobsearch.about.com/cs/curriculumvitae/f/cvresume.htm