IB retake rules: eligibility, limits, sessions and schools

IB retake rules separate three decisions: whether the IB permits the entry, whether a school will accept and register you, and whether the result meets Diploma or university conditions. The three-session limit was removed in 2023. Subject availability, the current syllabus and the treatment of written papers and coursework still need checking before you pay.

Why 26 total points can still require an HL retake

For a standard three-HL/three-SL combination, consider these illustrative grades:

Improving an SL subject in this example raises the total without fixing the HL shortfall. The IB criteria also specify core and low-grade conditions, plus different counting rules for four HL or two SL subjects.

Use the full score checklist, non-award guide and core-points matrix before choosing the subject to retake.

Rule 1: Confirm your eligibility

Previous Diploma and Course candidates can generally retake, subject to IB restrictions and coordinator confirmation. Ask the school to check your candidate record, especially after an absence, sanction or curriculum change. Common reasons for asking include having:

• Completed the full Diploma
• Sat individual subjects as a Course candidate
• Failed to achieve the Diploma
• Were absent from exams (with or without special consideration)

Not receiving the Diploma does not by itself prevent you from asking about a retake. The coordinator must still check the candidate record and the proposed registration.

Rule 2: The three-session limit was removed in 2023

The IB assessment FAQ confirms that the three-session rule was removed in 2023 for previous, current and future students. That removes a session-count limit; it does not guarantee entry at every school or under an old syllabus. Check the intended session and current subject requirements with the coordinator; the retake-limits guide explains those separate checks.

Rule 3: Find an IB school willing to register you

You may retake at a different IB World School offering the Diploma Programme, including in another country, if it accepts you and can register the required subject, level and session. The IB explicitly says schools are not obliged to accept retake candidates. An IB authorization alone is not proof of an available external place.

Learn more: How to retake at a different school

Rule 4: Confirm written papers and IA requirements

The IB’s assessment principles require all written examinations in a retaken subject to be sat again; previous written-paper marks cannot be carried forward. A non-examination component may be carried forward if curriculum and assessment requirements permit it.

Resubmitting non-examination work requires classes at the registering school so teachers can guide, mark where applicable and authenticate the work; confirm that arrangement separately. IBretake’s search covers exam hosting only.

• No new IA through IBretake: The platform does not arrange new IA, coursework, oral preparation, tutoring, or coursework supervision.
• Carry forward questions: If an existing IA mark or coursework component is relevant, confirm it directly with your previous school or the accepting IB coordinator.

Rule 5: Check an HL/SL change before paying

A change of level needs coordinator confirmation of the registration route, course requirements, coursework and diploma subject combination. Reasons to discuss it might include:

• You originally took HL but want to reduce the difficulty
• Your university condition needs clarification about HL and SL.
• You want to challenge yourself more with HL

Do not assume that a carried-forward mark or a university subject requirement will remain valid after changing level. IBretake does not arrange additional coursework or supervision.

Rule 6: A different subject is not a simple replacement

Taking Spanish B after French B is not simply re-sitting the same subject. A different course may involve new teaching, assessment and registration requirements. Ask an IB coordinator whether the proposed combination is permissible and how it would count towards your diploma before relying on a new subject to replace a result.

Rule 7: Best Grade Is Used for Diploma

Article 10.4 of the IB’s 2026 General regulations uses the highest grade achieved for a retaken subject or core requirement towards the Diploma award. For example, a 5 followed by a 4 in the same subject and level still contributes 5 under that rule. University admissions requirements are set independently: ask whether your retake and combination of sessions are accepted. Arrange the official transcript the university needs.

Rule 8: Complete the Diploma in a later session

If the Diploma was not awarded because of the total or another passing condition, a later result can complete the missing requirement. The full set of award conditions must then be satisfied using the eligible results. In the 26-point example above, improving the HL 3 to 4 fixes the HL total; improving an SL grade does not. Confirm the final award status with the coordinator.

Rule 9: Confirm the cost of the new registration

A later retake requires a new registration. Do not assume a previous payment covers it. For a direct school arrangement, ask for an itemised quote that distinguishes:

• IB assessment fees confirmed by the accepting school
• Selected subject or core component fees if applicable
• School administration fee (set by the school)

See the full cost breakdown.

Rule 10: Session Availability Varies

Not all subjects are available in both sessions:

• May session: Check the published subject, level and language schedule with the school.
• November session: Do not assume that the same subject and language options are offered as in May.

Additionally, not all schools offer both sessions. Check availability before committing. See our deadline guide for session timing.

Common Misconceptions

"You can only retake within one year"

The IB’s retake guidance allows a subject to be retaken in a future session; it does not set a universal one-year window. A later attempt still depends on school acceptance, subject availability and the curriculum and assessment requirements then in force.

"Retake grades are marked differently"

False. Retake work is assessed against the applicable IB assessment standards, not an easier retake-only standard. Confirm the current syllabus, paper variant and session rather than expecting the same paper as your earlier attempt.

"You need permission from your original school"

You are not required to retake at your original school. A new host still needs to accept you and confirm the registration route; records or coursework questions may require coordination with the previous school.