where and what exams to take for federal jobs in usa?

what is the website where we can find out what exams are available in what location to take federal jobs in usa?
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Some prereqs are included on job announcements at http://www.usajobs.gov/.

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Here are some helpful tips when seeking federal jobs:

Tip #1 - Identify and apply for appropriate federal positions.
 Identify positions for which you are interested.
All jobs that are available are advertised and posted on www.usajobs.gov, the site mentioned by motnahpoo

As you will notice; all vacancies have a full-text announcement and have a lot of legal and procedural information which must be included.
Review the Federal vacancy announcements and study the position requirements so that you can identify the types of positions which interest you most and those for which you qualify.

The others tips for a successful application:
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