IB Exam Zone Start Times May 2027: How to Read Your School's Schedule

International Baccalaureate (IB) exam zone start times for May 2027 are determined by an exact combination of an administrative zone letter (A, B, or C) and a specific numerical row assigned to each school. Morning sessions begin at 08:30, 09:00, 09:30, or 10:00 local time, while afternoon sessions commence at 12:30, 13:00, 13:30, or 14:00 local time depending strictly on that assigned row.

Last verified and updated: October 31, 2026

The International Baccalaureate Diploma Programme (DP) and Career-related Programme (CP) hold their global written examinations under a structured zone schedule designed to maintain assessment security across worldwide time zones. For the May 2027 session—which runs from Friday, 23 April 2027 through Tuesday, 18 May 2027—the IB does not use a single global clock time. Instead, the organisation allocates each authorised school to an explicit zone row. Because students frequently look up general timetables online and make incorrect assumptions based on neighbouring countries or national boundaries, understanding how to read your institution's specific zone designation is vital for punctuality and compliance.

How Do IB Exam Zones Determine Morning and Afternoon Start Times?

The IB assigns each school an exam zone code that links directly to a fixed morning (AM) and afternoon (PM) local start time. There is no variance between individual subjects within a session: every morning paper at a given school begins at the designated morning hour, and every afternoon paper begins at the designated afternoon hour.

The IB allocates each school to Exam Zone A, B, or C, further divided into numerical rows.

Morning session start times across the global network range from 08:30 to 10:00. Afternoon sessions range from 12:30 to 14:00. These listed hours represent official local time at the test centre. The IB explicitly confirms in its administrative guidance that local start times do not require any adjustments for daylight saving time (DST). If your region observes daylight saving in April and May, you simply follow your normal wall-clock time according to the official row.

What Are the 22 Assigned Zone Rows for the May 2027 Exam Session?

The official May 2027 schedule defines exactly 22 distinct letter-and-number rows across Zones A, B, and C. Every authorised IB World School testing in this session operates under one of these 22 specific combinations.

A careful examination of the 22 rows reveals why reading both the letter and the number is essential. Zone A spans ten rows (from 12 down to 3), where rows 12 through 9 begin at 10:00 / 14:00, row 8 begins at 09:30 / 13:30, and rows 7 through 3 start at 09:00 / 13:00. Zone B contains four rows (3 down to 0), where row 3 starts at 10:00 / 14:00, row 2 at 09:30 / 13:30, and rows 1 and 0 at 09:00 / 13:00. Zone C covers eight negative rows (-3 down to -10), featuring 10:00 / 14:00 for row -3, 09:30 / 13:30 for row -4, and an early 08:30 / 12:30 schedule for rows -5 through -10.

Crucially, the number 3 occurs in both Zone A and Zone B, but with different session hours. In Zone A, row 3 prescribes a 09:00 morning and 13:00 afternoon start. In Zone B, row 3 prescribes a 10:00 morning and 14:00 afternoon start. Relying solely on a numeral without verifying the zone letter will lead to a one-hour scheduling error.

Why Should You Never Guess an Exam Zone from a Country or UTC Offset?

Exam zones are institutional designations assigned directly by the IB to individual schools; they cannot be deduced from national borders, geographical longitude, or raw UTC offsets.

A common pitfall among students and parents is assuming that an entire country or region shares an identical IB exam zone. No country-wide zone assignment can be assumed. The IB communicates allocated zones directly to registered coordinators during the centre registration process. These allocations remain constant between examination sessions for that specific centre, but two schools located in close geographic proximity could theoretically operate under different administrative bands if assigned differently by the IB assessment division.

Furthermore, students often consult unverified school schedules shared online. In some published individual school calendars—such as internal timetables from Zone C schools operating at UTC-8—schools list operational session times like 09:00 and 13:00, even when the official Zone C row -8 designates 08:30 and 12:30. Such internal school documents often incorporate local assembly periods, registration buffers, or centre-specific scheduling adjustments. Treating an isolated school's 09:00 / 13:00 schedule as a universal IB rule is incorrect and risks candidates arriving late for official sittings.

When Do May 2027 IB Exams Take Place Across the Session Window?

The May 2027 DP and CP written examination period starts on Friday, 23 April 2027, and concludes on Tuesday, 18 May 2027. Individual candidates sit papers only for the specific subjects and levels in which they are registered.

The schedule is organised over four calendar weeks to balance candidate workload and minimise subject clashes. No student takes examinations on every single day of the four-week window. The table below illustrates how selected representative subjects across various disciplines are distributed across morning and afternoon sessions:

Table abbreviations: HL = Higher Level; SL = Standard Level; Paper 1a/1b = split multiple-choice and data analysis components.

Notice that language examinations strictly separate Reading Comprehension (Paper 2 Reading) and Listening Comprehension (Paper 2 Listening) across distinct afternoon and morning sittings. Similarly, Mathematics Paper 1 (13 May PM) and Paper 2 (14 May AM) fall on consecutive days, while HL Paper 3 follows on 18 May PM.

How Should Candidates Confirm Their Personal Examination Timetable?

Every candidate must obtain their finalised, individual statement of entry and daily room schedule directly from their school's IB coordinator. Only your school's administration can verify your centre's allocated zone letter, numeric row, and mandatory arrival times.

While the general session guidelines provide the framework, individual centres establish internal logistical rules. Confirm arrival time with your coordinator to allow for roll call, calculator clearing, and secure seating protocols. Furthermore, rescheduling an examination is strictly governed by the IB Global Centre in Cardiff; an individual school cannot adjust an exam date or session time without formal authorization from the IB Assessment Division.

As students organise their study calendars and balance coursework revisions, structured academic support—such as targeted IB tutoring—can help candidates prepare methodically for the specific paper formats and time constraints they will face in the exam room.

Official May 2027 examination schedule sent to schools by the IB (final version); consult your school's IB coordinator for exact local timings.

Frequently Asked Questions About IB Exam Zone Start Times

References and Schedule Documentation

• School-Hosted May 2027 Final Examination Schedule PDF — Complete 7-page official IB schedule showing all 22 exam zones, session timing rules, and subject timetables.
• Official International Baccalaureate Exam Schedule Page — General assessment guidelines and institutional schedule information from the International Baccalaureate Organisation.