What to Expect and the Mark to Target

TL;DR: No one can tell you the exact Cambridge IGCSE Biology (0610) A* boundary for June 2026 yet, because Cambridge only sets each threshold after the papers are marked and the cohort's performance is analysed. Over the last five June sessions the A* bar has ranged from about 144 to 173 out of 200, and which variant you sit changes the target sharply. Variant 2 — the route most Gulf students and Egypt take — has been the toughest, needing 173/200 in both 2024 and 2025. The single safest move is to aim for around 87% (about 174/200), which clears the A* line in every variant and every recent year. Here is what the history shows and how to read this session.

What will the IGCSE Biology (0610) grade boundaries be in June 2026?

No one — including Cambridge — can state the exact June 2026 IGCSE Biology grade boundaries yet, because the thresholds are only fixed after every script is marked and the whole cohort's performance is reviewed. Based on the last five June sessions, expect the A* bar to land somewhere in the high‑150s to low‑170s out of 200, depending on the variant.

Cambridge publishes its official IGCSE grade threshold tables only once results are issued, so any figure you read before then — including the range above — is an informed estimate, not a confirmed number.

Having examined Cambridge papers for decades, I never commit to a fixed boundary before I have seen the paper itself and the performance data, and you should be cautious of anyone who does. What I can say about this session is that it carried two unusual features: the paper felt slightly more demanding than recent years, and several centres across the Gulf and Lebanon faced disruption, with some sittings affected. Those two factors pull in opposite directions on the boundary, which is all the more reason to target a mark that is safe whatever happens rather than chasing a guess.

Can IGCSE Biology grade boundaries be predicted before the exam?

You cannot know the exact boundary in advance, but you can build a reliable range from past sessions. The A* threshold for 0610 has sat between 144 and 173 out of 200 across the last five Junes, so anything far outside that band would be a genuine surprise.

The trap is to read your mock result as a forecast. Your mock is local — it reflects your school and your teacher's marking — whereas the real boundary is global, set against tens of thousands of scripts worldwide. A mock that "felt easy" tells you almost nothing about where the national line will fall.

What is more predictable is the shape of the paper. After years of working with these syllabuses, the question types, command words and recurring topics are largely foreseeable, which is why students who revise from well‑structured IGCSE Biology and Chemistry revision notes tend to walk in recognising a large share of what they are asked. Recognition is what converts a wide boundary range into a comfortable margin.

How does Cambridge set IGCSE Biology grade boundaries each session?

Cambridge marks every script against the published mark scheme, then sets the grade thresholds using a mix of examiner judgement and statistical evidence, so that a harder paper requires fewer marks for the same grade. This is exactly why the A* mark shifts from session to session and why there is no fixed "A* = 90%" rule.

You can see the principle in how Cambridge marks and grades each script: raw marks on each component are weighted and combined to a total out of 200, and the variants are aligned so that candidates are treated fairly whichever paper they sat. The threshold is then placed where the evidence says the A* standard lies for that session.

In practice this protects you more than it threatens you. In sessions where the paper has run harder than usual, I have seen the A* threshold ease back accordingly — the system is designed so that a tough paper does not quietly cost a well‑prepared student their grade.

Why have IGCSE Biology A* boundaries climbed so high since 2021?

The three‑variant A* average for 0610 jumped from 145 out of 200 in 2021 to about 164 by 2023, and has stayed there since — a rise of roughly 9.5 percentage points in just two years. The low 2021 figures reflect pandemic‑era grading and are not a reliable benchmark.

There is no 2023‑style line for 2020 because Cambridge cancelled the June 2020 exams and awarded school‑assessed grades, so no threshold table was published. From 2021 the picture is clear: 2021 was the easiest year for an A*, needing only about 73%, while 2023 was the hardest on average at around 82%, after which the bar has plateaued high at 162–164.

My reading of why is straightforward: cohort performance has genuinely improved. Students arrive better prepared, the question types are increasingly well understood, and those who work through a structured IGCSE Biology course enter the exam already familiar with more than half of what they will face. When a whole cohort performs better, the statistical evidence pushes the A* line upward — which is why "last year's boundary" keeps proving too low a target.

Does it matter which variant (1, 2 or 3) my child sits?

Yes — it matters a great deal. Variant 2 (BY) has become the toughest route to an A*, demanding 173 out of 200 in both 2024 and 2025, while Variant 3 (BZ) asked for just 156–157 in the same years — a gap of 16 to 17 marks.

This is not an abstract point for Gulf families. The United Arab Emirates sits Variant 1, whereas Kuwait, the other Gulf countries and Egypt sit Variant 2 — meaning most of the region's students are on the single hardest variant. You do not choose your variant; it is set by your region and timetable zone, so the only sensible response is to prepare to the toughest bar, not the average one.

I have watched the Variant 2 climb catch out strong students in the Gulf who set their sights on the previous year's lower number and were left a handful of marks short. On a variant that has crept from 157 to 164 to 173 in three years, planning around last year's figure is planning to fall behind.

What mark should I target for an A* in June 2026?

Aim for about 87% — roughly 174 out of 200. That mark has cleared the A* boundary in every variant and every June session in the data, so it is safe whatever 2026 brings.

The classic mistake is to target "just above last year's boundary." On Variant 2 especially, that boundary has risen year on year, so a student aiming at 160 because that was enough in 2023 would have missed A* by 13 marks in 2024 and 2025. Build in headroom instead of betting on the line staying still.

The fastest way to build that headroom is volume of the right practice. Working through classified, solved past papers arranged by topic trains you to recognise question patterns and answer them in the style the mark scheme rewards, which is where most "lost" marks actually go. For students who want everything in one place, the full solved past‑papers package lets you drill whole sessions under timed conditions until 87% feels routine rather than exceptional.

When will the June 2026 IGCSE Biology grade thresholds be published?

The official June 2026 thresholds will only appear after results are released — Cambridge publishes the grade threshold tables alongside the August results. Until then, every figure you see online, including the range in this article, is an estimate built from past sessions.

When the time comes, you can find your session's numbers on the Cambridge IGCSE grade threshold tables page; look for the 0610 line under the relevant June series, and check the BX/BY/BZ option that matches your variant. If you would like help reading your result against the threshold — or building a revision plan to clear the A* bar comfortably — you can reach me on WhatsApp at +965 5137 5709 or by email at admin@chem-bio.info.

Frequently asked questions

Is there a fixed percentage for an A in IGCSE Biology?* No — there is no fixed "A* = 90%" rule, because the mark is set fresh each session. The A* threshold for 0610 has ranged from about 73% to 87% since 2021, so you should always check the table for your actual session.

Do the alternative-to-practical (Paper 6) routes have different boundaries? The CX/CY/CZ options that use Paper 6 instead of the practical test carry very similar A* thresholds. In 2024, for example, Variant 2 was 172 on the Paper 6 route against 173 on the practical route, so you can treat them as effectively the same target.

Will a harder June 2026 paper mean a lower A boundary?* Usually yes — Cambridge lowers thresholds when a paper proves more demanding, so a tough paper does not automatically cost you the grade. That is precisely why an 87% target protects you whichever way the boundary moves.

Where can I check the official boundaries myself? Cambridge publishes every session's grade threshold tables on its website, and your school's exams officer can access them too. Look for the 0610 line under the relevant June series once the August results are out.