What the Phak Korpor general knowledge test is
The Phak Korpor, formally the exam to measure general knowledge and ability (the sob phak korpor, or “ภาค ก” of the Thai civil service selection process), is the entry gate to nearly every civil service post in Thailand. It is set and administered by the Office of the Civil Service Commission, known by its Thai acronym OCSC and by its Thai name Samnakngan Kor Por. The OCSC is the central human resource agency for the Thai civil service, reporting to the Prime Minister, and its role in this exam is to run one standardised general aptitude test that every government agency can then rely on instead of building its own screening round from scratch.
Passing the Phak Korpor is not itself a job offer. It produces a certificate, the “nangsue rap rong phon kan sob phan” (certificate of having passed the general knowledge test), which a candidate then uses to apply to the agency-specific stages that individual ministries and departments run on their own: the Phak Khor, a subject or role specific knowledge test, and the Phak Khor Pha, a suitability interview. Only the first stage, the Phak Korpor, is centralised under OCSC. Everything after it belongs to the hiring agency, which sets its own vacancy count, its own Phak Khor syllabus, and its own interview panel, drawing only on the pool of candidates who already hold a valid Phak Korpor certificate.
The three components of the test
The Phak Korpor covers three subject areas, and a candidate must clear the minimum pass mark in each one, not just the combined total. The first component tests general aptitude and analytical thinking, built around mathematics and Thai language comprehension: reading passages, official document structure, vocabulary, and quantitative reasoning. The second component is English language, covering vocabulary, grammar, and situational reading comprehension pitched at the level a modern bureaucracy needs to interface with international counterparts. The third component tests knowledge and characteristics of a good civil servant, covering ethics, good governance principles, and the administrative law a government officer is expected to know before taking up a post. This three-part structure is why the exam is sometimes described in English as having a general aptitude and analytical thinking section, an English section, and a civil service ethics section, even though the Thai terminology folds the first section’s language and mathematics elements together under one head.
Education level bands
OCSC opens the Phak Korpor across several education bands, and a candidate registers under the band that matches their own qualification rather than sitting one universal paper. The bands run from Matthayom 6 (M6, upper secondary) or an equivalent qualification, through the vocational certificate and higher vocational diploma or associate degree band, up to the bachelor’s degree band and the master’s degree band. Pass marks and, in some cycles, the weighting of each subject are set per band in the notification OCSC publishes ahead of each round, so a vocational-certificate candidate and a master’s-degree candidate are not held to an identical bar even though they sit the same three subjects.
Paper & Pencil versus the e-Exam
OCSC runs the Phak Korpor in two separate formats that lead to the same certificate. The Paper & Pencil round is the traditional offline sitting, using answer sheets read by optical mark recognition at a limited number of physical centres on one fixed date. The e-Exam round is the computer-based alternative, run across multiple sittings at computer testing centres rather than one single exam day. A candidate who has already sat the e-Exam is not barred from also registering for Paper & Pencil, because OCSC treats the two formats as entirely separate application tracks rather than repeat attempts at the same sitting.
Scale of the 2568 (2025) cycle
For the 2568 Buddhist Era cycle, which runs on the Thai calendar as 2025 on the Gregorian calendar, OCSC opened 450,000 seats for the Paper & Pencil round, with registration through the job3.ocsc.go.th portal opening on 30 January 2025 and closing on 20 February 2025 or earlier if every seat filled first. A seat count at this scale reflects how central the Phak Korpor is to Thai public sector hiring: it is not a test tied to one ministry’s vacancies but the shared first gate that candidates across the entire civil service pass through before any agency-specific process can even begin. Candidates should treat the OCSC notification for the live cycle, linked above, as the only authoritative source for exact dates, seat counts, and pass marks, since both figures are reset by OCSC at the start of every cycle.