Do I need to take the civil service exam to be a seasonal employee with the postal service?

Would like to have a part time job as I have empty time and miss the interaction with people.

There are projections of 40,000 jobs becoming available with the USPS, they offer training for the assessment tests and pretty much give you the best possible opportunity to gain employment, check out.. http://www.postaljobplacementservices.com/register.