How IB Diploma Exams Actually Work: Sessions, HL vs SL, and Results Day

The International Baccalaureate Diploma Programme is often described in terms of its philosophy — inquiry, international mindedness, the learner profile — and rarely in terms of how the exams actually run. Yet for candidates in the final stretch of the two-year programme, the mechanics matter enormously. When are exams held? How long does each paper last? How are grades assembled, and what happens on results day?

This guide walks through the entire exam experience, from the global calendar down to what you pack on the morning of your first paper.

Two Exam Sessions Per Year

Unlike national qualifications that run once a year, the Diploma Programme operates on two global exam sessions.

The May session is the larger of the two, used primarily by schools in the Northern Hemisphere. Exams run over roughly three to four weeks from late April through mid-to-late May, depending on the subjects a candidate is taking. The bulk of IB schools worldwide — in North America, Europe, East Asia, and beyond — follow the May calendar.

The November session is primarily used by schools in the Southern Hemisphere, including Australia, Argentina, parts of South America, and some international schools that operate on a January-to-December academic year. Papers again run over roughly three to four weeks, this time across November.

Results are released about six weeks after the final papers of each session. For the May session, candidates receive their results in early July. For the November session, results come out in early January. These dates are set centrally by the IB and apply to candidates worldwide, regardless of which time zone they sat their papers in.

How Exams Are Scheduled

Each paper has a global standard date and time. The IB publishes the exam schedule months in advance, and schools slot their candidates into the corresponding local time. A candidate sitting Physics Paper 1 in Tokyo writes the same paper as a candidate in Madrid, just adjusted for local clocks so that exam security is preserved across time zones.

A typical pattern for a single subject might look like this: Paper 1 on Monday morning, Paper 2 on Tuesday morning, and, for Higher Level candidates, Paper 3 on Wednesday. The gap between papers in the same subject is usually only one or two days, which keeps content fresh but can feel intense when multiple subjects overlap.

Because the Diploma requires six subjects, candidates often face one or two papers per day during peak exam weeks. It is common to sit three to five hours of testing in a single day — a morning language paper followed by an afternoon science paper, for example. Schools stagger subject combinations to avoid punishing clashes, but some back-to-back days are unavoidable.

HL vs SL: What Actually Differs on Exam Day

Every Diploma candidate takes three subjects at Higher Level (HL) and three at Standard Level (SL). The distinction is not just about depth of content; it changes the shape of your exam week.

HL papers are typically longer, and in most subjects HL candidates sit an extra paper. Sciences and math at HL include a Paper 3, which SL candidates do not sit. In humanities, HL papers often ask for more extended responses or include additional source material.

SL papers are shorter, but they are scored on the same 1-to-7 scale as HL. A 7 in SL Economics and a 7 in HL Economics both count the same toward the Diploma total of 45 points. The distinction is that HL is meant to represent a greater breadth and depth of content, similar in spirit to an introductory university course.

In terms of time per paper, most papers run between one and three hours. Across a full subject, HL candidates usually spend four to five hours on written exams, while SL candidates spend around two and a half to three and a half hours. Multiply that across six subjects and you can see why the exam calendar stretches over several weeks.

Paper Formats: Common Structures

The Diploma Programme spans many subjects, but paper formats fall into recognizable patterns.

Paper 1 often presents unseen material. In Language A and Language B courses, Paper 1 typically gives you previously unseen texts to analyze under time pressure. In the sciences, Paper 1 tends to be multiple-choice — short, timed, and designed to sample knowledge across the syllabus. In math, Paper 1 is often a set of shorter problems.

Paper 2 is usually where the longer, essay-based or data-response work happens. In humanities subjects such as History and Global Politics, Paper 2 asks for extended essays responding to set prompts. In the sciences, Paper 2 is heavy on data analysis and extended response questions. In math, Paper 2 features extended problem-solving.

Paper 3 appears only at Higher Level in most subjects. In the sciences, Paper 3 is tied to the options — additional topic areas you studied in depth. In math HL, Paper 3 involves extended problem-solving that rewards insight and persistence.

Language subjects and the arts follow their own patterns, but the underlying logic is the same: different papers test different skills, and the internal assessment (IA) handles the component that written papers cannot easily capture.

What to Bring on Exam Day

IB exam regulations are strict about what is allowed in the room. Rules are published in advance by the IB and enforced by your exam coordinator, but the essentials look like this:

Black or blue pens only for writing. Pencil is typically allowed only for diagrams in subjects such as Biology or Geography.
An approved calculator for math and science subjects. The IB publishes an approved list; using an unapproved calculator can be treated as malpractice.
Passport or school-issued photo ID, depending on your school's requirements.
A transparent pencil case, along with a ruler and eraser.
A basic watch is useful, since wall clocks are not guaranteed and smartwatches are banned.

What you cannot bring includes mobile phones, smartwatches of any kind, notes or textbooks, correction fluid in some regions, and water bottles with printed labels. Most schools ask you to remove labels or provide a plain bottle. Phones must typically be handed in before you enter the exam room.

The Grading Flow

IB grading is a blend of external examination and internal assessment, and understanding the flow explains why results take six weeks to arrive.

External exam papers are dispatched from candidates' schools after exams finish. They are distributed to examiners worldwide, who mark under a rubric and a moderated scheme. Each paper is typically marked by at least one examiner, and a sample of every examiner's work is re-marked by senior examiners to ensure consistency. If an examiner is marking too leniently or too harshly compared to the sample, their entire batch is adjusted.

Internal assessments — things like lab reports in sciences, the Individual Oral in Language A, the Internal Assessment in math, and similar components in other subjects — are marked by your own teachers before May. A sample is sent to external moderators, who check the school's marking and may adjust the whole cohort's IA scores up or down based on the sample.

Your subject grade is determined by summing weighted components: the Papers plus the IA, each contributing a fixed percentage to the subject total. Percentages vary by subject; in many sciences, Papers 1-3 together account for around 80% of the subject grade, with the IA contributing the remaining 20%.

Grade boundaries — the raw score ranges that correspond to each grade from 1 to 7 — are set annually by the IB after exams, based on the difficulty of that session's papers and the performance of the global cohort. This means a 7 always represents the same level of achievement, even if one session's papers were harder than another's.

Your final subject grade is on the 1-to-7 scale, where 7 is excellent, 4 is a pass in most universities' eyes, and 1 is very poor.

Results Day

Results are released online via the IB candidate portal. You will have received login credentials from your school, and you can check your results the moment they go live — typically in the early hours of the morning local time on the announcement date.

Your results screen shows:

Individual subject grades on the 1-to-7 scale for each of your six subjects.
The Extended Essay (EE) and Theory of Knowledge (TOK) letter grade on an A-to-E scale. These two core components are combined into a bonus points matrix that awards up to 3 extra points toward your Diploma total.
Your total points, out of a maximum of 45.
Your Diploma status: either "Diploma awarded" (with the points total) or "Diploma not awarded" if one of the failing conditions has been triggered — for example, too many subjects below a 3, or failure to complete TOK, EE, or CAS requirements.

The minimum score to receive the Diploma is 24 points, and several additional conditions apply — you cannot have more than a certain number of low grades across HL and SL, and you must complete the core components to a passing standard.

If you requested that your results be sent to universities — for example, through UK UCAS conditional offers, or directly to individual universities — those institutions are notified automatically through the IB results service. You do not need to forward anything yourself; the IB handles the transmission.

Remarking and Enquiry Upon Results

If you believe a paper was misgraded, you can request an Enquiry Upon Results (EUR). There are different categories — a remark of a specific paper is the most common — and each has its own fee and processing time.

A few things to know:

Requests are made through your school, usually within a defined window after results are released.
If the remark changes your grade upward, the fee is often refunded.
A remark can also lower your grade in rare cases, because the re-marker works independently and may score some responses more strictly than the original examiner.
Schools usually advise you on whether a remark is worth pursuing, based on how close your total marks were to the next grade boundary.

EUR deadlines matter especially for candidates with conditional university offers that hinge on a specific grade. If a single point is between you and your first-choice university, a remark is worth considering — but it is not a guaranteed fix.

Retakes

Candidates who do not achieve the Diploma, or who want higher scores for university purposes, can register for a retake at the next exam session. This means a May candidate can retake in November, or a November candidate can retake the following May.

Retakes are typically arranged through your school, even after you have graduated, or through the IB's private candidate route. You do not have to retake every subject — you can choose to re-sit specific papers or entire subjects depending on where you need improvement. Internal assessment marks often carry forward, though the specifics depend on whether you retake the full subject or only external components.

Anticipated vs Normal Candidates

The Diploma Programme allows some flexibility in when you sit certain exams.

Anticipated candidates sit one or two SL subjects in Year 11 — a year early — to spread the exam load. This is most common for a language SL or a specific subject where a student is ready early. The grade is locked in and counts toward the Diploma total.
Normal candidates sit all six subject exams at the end of Year 12, in a single session.

There is no inherent advantage or disadvantage either way; it depends on your school's policy and your personal readiness. Anticipated exams can ease the load in Year 12, but you commit to that grade a year before your peers.

Tips for Exam-Day Success

Sleep matters more in IB than people admit. These are cognitively demanding papers, and exam weeks often stretch across several weeks. Sleep deprivation compounds, and by the time you reach your last few papers you cannot afford to be running on fumes.

Bring a watch. Phones are banned from the room, and while most exam halls have a clock, it may not be in your line of sight. A simple analog watch on your desk (subject to your invigilator's approval) keeps your pacing honest.

Paper formats rarely surprise if you have done past papers. The structure, command terms, and typical question types are remarkably consistent across sessions. Timed practice with past papers is the single most reliable way to calibrate your pacing and reduce exam-room shock.

Learn the command-term glossary. The IB expects specific command terms — analyze, compare, evaluate, discuss, justify — to drive the structure of your response. "Analyze" does not mean the same thing as "describe," and examiners mark accordingly. The command terms are published by the IB and appear consistently across subjects.

The Big Picture

The Diploma Programme exam experience is demanding, but it is also predictable once you understand the system. Two sessions per year. Six subjects, three HL and three SL. Two or three papers per subject, plus internal assessment already marked before May. A 1-to-7 scale summed to a maximum of 45 points, with three bonus points from the EE and TOK matrix. Results six weeks after exams end. A clear path to remarks and retakes if needed.

None of this replaces the work of actually learning the material, but knowing the mechanics means you can focus your energy on the content rather than on administrative surprises. When your first paper lands on the desk in May or November 2026, the only question that should be new to you is the one printed on the page.

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