5 U.S. Code § 3305
5 U.S. Code § 3305 is about Competitive service; examinations; when held. It is under Part 3 (Employees) Subpart B (Employment and Retention) Subchapter 1 (Examination, Certification, And Appointment) Chapter 33 (Examination, Selection, And Placement) of Title 5 (Government Organizations and Employees) of the Code.
(a) The Office of Personnel Management shall hold examinations for the competitive service at least twice a year in each State and territory or possession of the United States where there are individuals to be examined.
(b)The Office shall hold an examination for a position to which an appointment has been made within the preceding 3 years, on the application of an individual who qualifies as a preference eligible under section 2108(3)(C)–(G) of this title. The examination shall be held during the quarter following the application.