How to win bids on freelancer sites

When you start your career you mostly do regular jobs or internship. After doing some months of jobs you probably think that you want to do work for your own and get projects from net. So you try to get projects from freelancer sites. There are many freelancer sites like elance.com, odesk.com, freelancer.com and others. In some freelancer sites you have to complete test to bid on projects [...]