Your best source of information for this would be to look at the test objectives that are posted on our web site.
Certification is open to anyone who wants to take the tests.
No specific requirements are necessary, except payment of the fee. The scaled score will represent a score from 100 through 900. CompTIA will be transitioning more of their exams to a scaled score format in the future. The scaled score pass requirement is 752. Yes, each time you take the test, there will be a fee.