Statistically it takes only 20 seconds for an employer to reject your CV!!!
Why are CVs rejected?
First impressions
First impressions matter; if your CV does not attract the reader's attention in the first 20-30 seconds then your chances of obtaining an interview are greatly reduced. An employer may have a hundred or more CVs to look through and probably only a couple of hours in which to make their selection. So put your work experience at the start of your CV, not personal or educational details, unless you have only just left education.
What an employer really wants to know is why they should invite you for an interview. For this reason a short summary of your capabilities and/or a list of your major achievements can often be a good idea. This should make an employer want to invite you for an interview - but please be careful that you do not oversell yourself.
Poor visual layout
The visual layout of your CV is very important. Even though the wording you use may be correct, if people cannot find the information they want quickly they will move on to someone else's CV. You should use plenty of 'white' space in your CV and appropriate headings and section breaks.
Always use a word-processor/DTP package. Never use a typewriter as you will look old fashioned and out of date. Use good quality A4 paper, preferably 100 gram for both your CV and cover letter.
Length of CV
It is usually best to try and keep your CV to two pages of A4, unless someone specifically asks you for a longer CV. If you cannot keep your CV to this length then you probably have not understood an employer's requirements. Employers do not want to know your whole life history - just enough to decide whether they should interview you or not.
refer to the following links to update your CV and ensure a good chance of being selected for an interview
http://content.monster.co.uk/section4664.asp
http://docs.google.com/templates?q=resume
http://www.kent.ac.uk/careers/cv.htm
http://www.cvtips.com/basics_of_good_CV.html
http://www.careers4graduates.org/job_seeking/jsgdcv.phtml
http://www.cv-masterclass.com/cv-demo1.html
http://www.businessballs.com/curriculum.htm
http://www.totaljobs.com/Content/CVs_and_job_applications/Cv-templates.html
http://www.bradleycvs.co.uk/cv-writing-tips/cv-leave-out-1.htm
http://www.alec.co.uk/cvtips/index.htm
hope this was useful 
these were given to us by a lecturer.. reliable source 
