IGCSE Maths Grade Boundaries 2026 (0580): Predicted A*/A Thresholds + 5-Year Historical Data

A Cambridge IGCSE grade boundary is the minimum total mark needed to achieve a given grade in a specific session. For Mathematics 0580 Extended, Cambridge publishes one set of boundaries per session (May/June and October/November) and these apply to the combined total of Paper 2 (100 marks) and Paper 4 (130 marks), giving a maximum of 230. Boundaries are not fixed in advance. Cambridge sets them after the papers have been marked, using a statistical process called comparable outcomes that compares the current cohort's performance with previous cohorts. If a session's Paper 4 was harder than usual, the A* boundary drops to keep the proportion of A* grades broadly comparable year-on-year. If a session was easier, the boundary rises. This matters for two reasons. First, it means you should never chase a percentage target: "I want 83%" is meaningless because the boundary might be 82% one session and 76% the next. Second, it means the raw-mark target you actually need to hit is more stable than it looks on paper — because Cambridge smooths out the paper-to-paper difficulty variation for you. Your job is to outperform the historical boundary range by a comfortable margin in your mocks.

The table below shows the Cambridge IGCSE Mathematics 0580 Extended combined (Paper 2 + Paper 4) raw-mark boundaries for A* and A across the May/June and October/November sessions from 2021 to 2025. Figures are drawn from Cambridge's published grade thresholds on the official CAIE site. The maximum total across both papers is 230 marks.

Three patterns emerge from the 2021-2025 data that directly shape what to expect in May/June 2026. First, the May/June A* boundary has trended upwards from 185 (2021) to 190 (2025), with 2023 hitting a peak of 192. This is consistent with a global cohort that has recovered from the pandemic-era disruption and is now performing at or above pre-2020 levels. Second, the gap between A* and A has remained remarkably stable at 34-36 marks across all ten sessions examined — meaning if you can predict the A* threshold, you can derive the A threshold with high confidence. Third, paper-to-paper difficulty variation has been absorbed almost entirely by boundary adjustments rather than by cohort performance: raw total marks have stayed in a narrow band. Taking these three observations together, our data-driven forecast for Cambridge IGCSE Mathematics 0580 Extended May/June 2026 is: A* boundary 188-191 (central estimate 190), A boundary 153-157 (central estimate 155). Students who consistently score 195+ in their full mocks with fair self-marking sit comfortably in A* territory; students scoring 160-175 sit between A and B and have the clearest route to gaining ground through targeted topic work in the final weeks.

The Grade Calculator on this site is pre-loaded with the latest available Cambridge boundary data and an updated model that incorporates the 2026 forecast above. To use it productively, complete a full past paper under timed conditions (ideally May/June 2024 or Oct/Nov 2024), self-mark with the published mark scheme, and enter your raw Paper 2 and Paper 4 totals. The calculator returns an estimated grade and, critically, the number of marks separating you from the next grade up. That delta is the single most useful number in your final-month planning: if you are 12 marks below the A* threshold, you do not need a general-purpose "study more" plan — you need to identify which 12 marks, across which topics, are most realistically recoverable. In my experience, for students sitting at 175-185, the fastest gains come from three sources: algebraic manipulation on Paper 2 (surprising number of single-mark errors per paper), trigonometry in non-right-angled triangles on Paper 4, and probability from two-way tables and Venn diagrams where misreading the question is the dominant failure mode. Pair the Grade Calculator output with the May/June 2026 Complete Countdown Guide on this site to map your delta onto a concrete four-week plan.

Three misconceptions come up again and again in parent and student conversations, and getting them right will save you unnecessary stress. First: "grade boundaries are secret until after the exam." True, but this is the feature, not the bug — it protects the integrity of the comparable-outcomes process. Historical boundaries are the best predictor you have, and ten sessions of stable data is a very strong basis. Second: "the boundary was higher this year because the paper was easy." Partly true, but more importantly the boundary reflects the cohort's overall performance, not just perceived difficulty. A paper can feel hard to one candidate and easy to another, and Cambridge's process corrects for this. Third: "if I get exactly the A* boundary mark, am I safe?" Technically yes — the boundary is the minimum mark for the grade — but in practice you want a buffer of 3-5 marks because re-marks, carry-over errors on method marks, and the rare paper-total recalculation do happen. The safest posture is: aim 5+ marks above the historical upper-bound boundary in every mock, and you have built in resilience.