For M28 students, who started DP1 in August 2026 and take examinations in May 2028, the answer is clear: you cannot complete the full IB Diploma with only two HL subjects. An only two HL IB combination does not meet the requirement to study at least three subjects at Higher Level.
A school might temporarily place you in two HL classes while arranging an approved change, but this cannot remain your final diploma combination. If dropping an HL would leave you with two, you need to raise another subject to HL, enter a different HL, retain your current course, or consider DP Course Results instead of the full diploma.
How many HL subjects does the IB Diploma require?
Diploma Programme students study six subjects, with three or four at HL and the remainder at Standard Level. The official IB Diploma Programme curriculum overview identifies three HL subjects as the minimum and four as the maximum.
| Subject combination | Valid for the full diploma? |
|---|---|
| 3 HL and 3 SL | Yes |
| 4 HL and 2 SL | Yes, with school approval |
| 2 HL and 4 SL | No |
| Fewer than six diploma subjects | No, although Course Results may be possible |
HL courses involve greater depth, additional content or different assessment demands. The IB recommends 240 teaching hours for each HL course and 150 hours for each SL course. The IB general regulations also require HL subjects to be taught across the programme's two years, which helps explain why entering a new HL becomes harder as DP1 progresses.
The subject-group rules still apply
Having three HLs is not the only requirement. Students normally take at least one subject from Groups 1-5, plus an arts subject from Group 6 or another permitted subject from Groups 1-4.
| Group | Subject area |
|---|---|
| 1 | Studies in language and literature |
| 2 | Language acquisition |
| 3 | Individuals and societies |
| 4 | Sciences |
| 5 | Mathematics |
| 6 | The arts or an eligible replacement |
Environmental systems and societies (ESS) can satisfy both the Group 3 and Group 4 requirements, as explained in the IB diploma structure and passing criteria. However, ESS remains one course with one grade. It does not count as two subjects or reduce the three-HL minimum.
What can you do if dropping an HL leaves only two?
Raise a current SL subject to HL
This is often the simplest solution when your school teaches both levels in compatible classes. Approval depends on your attainment, timetable, class capacity and ability to catch up with HL-only material.
Ask the teacher for a specific list of missed topics, texts, practical work and assessment components. Do not assume that moving from SL to HL only means completing harder questions.
Replace the subject with another HL
You may be able to leave one HL and enter a different subject directly at HL. This is most realistic early in DP1, before substantial content and assessment preparation have been missed.
A complete IB subject change is normally more demanding than changing the level of a subject you already study. The RevisionDojo guide to switching IB subjects mid-year explains the academic and scheduling issues involved.
Remain in the current HL
If no valid replacement fits, remaining in the course may be necessary. First identify whether the difficulty comes from the content, pace, teacher, workload, study methods or one disappointing result.
Early struggles do not always indicate a genuine mismatch. The guide to IB subject selection regret can help distinguish an adjustment problem from a subject that is genuinely unsuitable.
Move to DP Course Results
Students may receive DP Course Results for individual subjects or core components without earning the full diploma. The IB assessment FAQ explains that course students may take as many or as few subjects as their school permits.
This is a significant programme change, not an exception to the HL rule. It may affect university eligibility, school graduation and how your qualifications are evaluated.
Who approves a DP1 switch?
Your school approves subject and level changes. Students and parents cannot independently amend an IB registration, because the DP coordinator handles registrations and amendments through IBIS.
Schools may impose internal deadlines earlier than IB administrative deadlines. They need time to check the timetable, class capacity, missed teaching, subject-group rules and registration records. The RevisionDojo coordinator guide to subject changes outlines these practical constraints.
Ask your coordinator to confirm:
- Whether the proposed class has space
- Whether the timetable permits the change
- Which content and assessments you must catch up
- Whether the combination remains diploma-valid
- Whether university prerequisites are affected
- Whether registration or amendment fees apply
- When the change becomes official
Fees are not universal. They depend on school policy, registration timing and whether the school passes administrative costs to students.
How to evaluate the proposed change
Write down the precise reason for leaving the HL, then compare your current and proposed combinations. Check the number of HLs, all subject groups, timetable blocks, catch-up requirements and university entry expectations.
A switch that satisfies IB rules can still be unsuitable if it removes a required HL for a future degree. Meet the current teacher, proposed teacher and coordinator where possible, bringing recent assessments and asking what successful catch-up should look like over the next 2-4 weeks.
A structured six-subject time-management plan may reveal whether workload is the real issue. If a change is approved, the RevisionDojo Study Planner can turn the catch-up list into scheduled tasks.
Common mistakes to avoid
- Dropping an HL before confirming its replacement
- Assuming every school uses the same deadline
- Ignoring university subject prerequisites
- Underestimating missed HL content or assessment work
- Believing ESS counts as two separate subjects
- Relying on informal approval instead of coordinator confirmation
Conclusion
You cannot earn the full IB Diploma with only two HL subjects. If dropping a course would create that combination, you must normally promote another subject to HL, change to a different HL, remain in the original course, or discuss leaving the full diploma pathway.
Confirm the timetable, catch-up work, university implications, official effective date and possible fees before changing anything. RevisionDojo's Study Planner and subject-change guidance can help you prepare a realistic proposal for your coordinator.
Sources and referenced URLs
- IB Diploma Programme curriculum
- IB General Regulations: Diploma Programme
- IB Diploma Programme passing criteria
- IB assessment FAQ
- RevisionDojo guide to subject selection regret
- RevisionDojo guide to switching subjects mid-year
- RevisionDojo coordinator guide to subject changes
- RevisionDojo time-management guidance
- RevisionDojo Study Planner