The entry level exam for prospective D.C. police officers will be given on a walk-in basis at 8:30 a.m. Saturday at Ballou High School, Fourth and Trenton streets SE.

The exam will establish a new register from which candidates will be drawn for entry level vacancies. It will be given on a first-come, first-served basis.

In order to be eligible to take the exam, participants must be 21 to 29 years old; U.S. citizens with vision no worse than 20/60, correctable to 20/20; able to pass a physical exam and a background check of any previous problems with the law; be between 60 and 77 inches tall, and have either a high school diploma or equivalency certificate, or one year experience as a sworn police officer in a city of one-half million or more people. They must either live in the city or move in within 180 days of employment.

Applicants will complete a job application at the time of the exam and should bring with them their Social Security number, present mailing address and telephone numbers, date of birth, citizenship status, eligibility for veteran's preference, and information about their education and previous work experience.

A study guide for the exam is available through tomorrow in Room 301, 613 G St. NW, weekdays from 8:15 a.m. to 4:45 p.m.

Information on duties of police officers is available by calling 727-4236, and information on the exam process is available by calling 727-6099.