Did IGCSE Grade Boundaries Go Up in 2026? We Compared All 79 Routes

Cambridge published the June 2026 IGCSE grade thresholds at 06:00 UK time on Tuesday 18 August 2026, alongside results. We downloaded all 88 subject tables that morning, pulled the June 2025 tables for the same syllabuses, and compared them route by route.

The answer to the question everyone was asking all summer: boundaries mostly went up. Of the 79 A* entry routes that exist in both years on identical terms, 53 rose, 22 fell and 4 did not move. The average movement was +2.9 marks.

Did IGCSE grade boundaries go up or down in June 2026?

Up, on balance, and by more than the usual drift. Two thirds of the routes we could compare rose, the mean movement was +2.9 marks, and 11 routes moved by ten marks or more — in a normal series most movements sit inside a handful of marks either way.

But "on balance" is doing real work in that sentence. This was not a uniform rise. Physics went up on every single extended route; Business Studies went down on every single one. The average hides two different stories, so the per-subject table below matters more than the headline.

What moved, subject by subject

Mean movement in the A* threshold, June 2025 → June 2026, across every entry route we could match. A positive number means more marks were needed this year.

The five biggest rises — and the three biggest falls

Biology appears in both halves of that table, which is the clearest illustration of why a single national headline about "the 2026 boundaries" is meaningless. One Biology route needed 15 marks more than last year; another needed 7 fewer. Same syllabus, same session, opposite directions — because they were different papers.

Why boundaries rise, and why that is not a punishment

A grade boundary is not a target set in advance and it is not a measure of how strict the examiners felt. It is set after marking is complete, once senior examiners have seen the real scripts from the real paper, and its only job is to keep a grade meaning the same thing from one series to the next.

So the causation runs the opposite way to how it feels on results day:

• Boundary went up → the paper was easier than the equivalent paper last year, so the same standard of work earned more raw marks.
• Boundary went down → the paper was harder, so fewer raw marks represented the same standard.

Physics rising 16 marks does not mean 2026's Physics candidates were held to a higher standard than 2025's. It means that particular Physics paper was more generous, and the line moved to cancel the difference out. That is the mechanism working, not failing.

An A* is not a percentage

The most useful thing in this year's tables is not any single movement — it is how far apart the subjects sit at the same grade, on the same morning, from the same board:

If you have been carrying around a private rule that an A* is "about 90%", three of those four numbers say otherwise. Raw marks are not comparable across papers — a mark on a paper where full marks are routinely achievable means something different from a mark on a paper where nobody finishes. The boundary is what makes the grades comparable when the marks are not.

The 15-mark gap inside a single subject

Within Mathematics 0580 this June, the A* threshold for the Extended route sitting papers 21 and 41 was 162 out of 200. For the route sitting papers 22 and 42 it was 177 out of 200. Fifteen marks apart, both A*, both this summer.

That is not an error and it is not a scandal — variants are written for different exam zones and are never exactly equal in difficulty, which is precisely why each one gets its own line. But it does mean the single most common results-day mistake is searching for "IGCSE maths grade boundaries 2026", finding one number, and measuring yourself against it. Find the row that matches the papers on your own statement of entry.

What to do with this today

1. Find your entry route, not your subject
   Your statement of results and your exams officer both show which components you sat. Match that combination in the official table — the June 2026 thresholds are collected here.
2. Convert your grade into a distance
   Ask your exams officer for your component marks. "I got a B" is not actionable; "I was four marks below the A" is.
3. If the gap is small, ask about a review of marking
   A couple of marks below a line is the case where an enquiry about results is worth considering — knowing that grades can move down as well as up. Your centre owns the deadline, so ask them today rather than reading a date online.
4. If the gap is large, look at November
   The November 2026 series is the reset, and entries close in mid-September — earlier at most schools and British Council centres.

FAQ

One closing thought, for anyone reading this while holding a result they did not want. A sixteen-mark swing in a line nobody could see coming is exactly the argument for building a margin rather than aiming at a target. Students who finish the year scoring ten marks clear of the grade they need do not have a results day that depends on which way the boundary moved. That margin is built by working real past papers and getting them marked long before August — and if this series did not go your way, the November window is still open.