If you are searching for clear information on Edexcel IGCSE Biology grade boundaries, this guide covers the paper structure for syllabus 4BI1, the grade thresholds Pearson Edexcel has published in recent years, the patterns they follow, and the most-asked question for any IGCSE Biology candidate: what raw mark do I need for an A* in Edexcel International GCSE Biology?

Pearson Edexcel publishes official grade boundaries for every subject after each series. The published documents are authoritative — but they are dense and rarely give a student the answer they need quickly. Below we summarise how Edexcel IGCSE Biology 4BI1 is graded, what the boundaries usually look like, and how to use them while you revise.

Free tool: Use Tutopiya’s Edexcel IGCSE Biology grade boundary tracker (4BI1) to enter your raw mark and instantly see the most likely grade band based on published Edexcel thresholds.

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How Edexcel IGCSE Biology grade boundaries work

A grade boundary is the minimum total raw mark required for a particular grade. For Pearson Edexcel International GCSE Biology (syllabus code 4BI1), grades range from A* down to G, with anything below G ungraded.

Three points to remember:

1. Boundaries are set after marking. Edexcel looks at the difficulty of the actual papers sat and the cohort’s performance, then sets thresholds so that comparable candidates receive comparable grades across series.
2. Thresholds change every series. A May/June boundary is not the same as a January boundary. They cluster within a band, but the exact mark moves up or down each session.
3. Boundaries are total marks, not percentages. Edexcel publishes them as raw marks out of the total available across both papers.

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Edexcel IGCSE Biology paper structure (4BI1)

Pearson Edexcel International GCSE Biology (4BI1) is assessed across two written papers:

Paper	Title	Marks	Duration
1B	Biology Paper 1	110	2 h
2B	Biology Paper 2	70	1 h 15 min

A candidate sitting 4BI1 takes both papers for a combined total of 180 marks. There is no Internal Assessment for Edexcel IGCSE Biology; the qualification is fully assessed by external written examination.

Edexcel publishes a single set of A*–G thresholds per series, applied to the combined raw mark.

For full details, refer to the Edexcel International GCSE Biology specification and your school’s exam officer.

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What raw mark do I need for an A* in Edexcel IGCSE Biology?

Across recent series, the A* threshold for Edexcel IGCSE Biology 4BI1 has typically required somewhere in the 80–90% range of total marks — but the exact figure shifts each session.

Representative bands from published Edexcel thresholds:

• A* has commonly required around 82–88% of total marks in recent series (around 148–158 out of 180).
• A has commonly required around 70–76%.
• B has commonly required around 58–64%.
• C has commonly required around 46–52%.
• D has commonly required around 34–40%.
• G (the pass mark) has commonly sat around 18–24%.

Two caveats apply:

1. These are typical bands, not predictions. A particular series might sit a few marks above or below.
2. Edexcel publishes thresholds as raw marks, not percentages. Always work from the published raw-mark threshold for the specific series you are looking at.

The Tutopiya grade boundary tracker for Edexcel IGCSE Biology stores published threshold data and converts your raw mark into a likely grade band.

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Why Edexcel IGCSE Biology boundaries move each series

Three factors drive most of the year-to-year variation:

• Paper 1B difficulty. Paper 1B carries 110 marks and decides much of the final grade. A particularly demanding question on genetics, transport in plants or human physiology will see Edexcel lower the threshold slightly so candidates are not penalised.
• Paper 2B variation. Paper 2B carries 70 marks and includes more demanding extended-response questions. Variations between series can move the overall threshold by a few marks.
• Cohort performance. If the global cohort performs unusually well or poorly, thresholds adjust to maintain fair comparison with previous years.

This is why Edexcel does not publish boundaries before the series — they have to be set against the cohort’s actual performance.

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How to use Edexcel IGCSE Biology boundaries while you revise

Grade boundaries are most useful before results day. Three practical applications:

1. Convert past-paper marks into a target grade

When you sit a past Paper 1B under timed conditions and score 78/110, that number alone tells you little. Cross-reference with the published threshold for that series — or with the combined-paper boundary — and you immediately know whether you are tracking at A, B or C standard. The Edexcel IGCSE Biology tracker does this conversion automatically when you enter your mark.

2. Identify the gap to your next grade

If you are scoring 70% combined and the historical A* boundary is 84%, you know you need to pick up around fourteen percentage points to be on the A* border. Combine the gap with a confidence-rated revision checklist to choose where those marks come from — typically genetics, transport, gas exchange or extended response questions.

3. Sanity-check your predicted grade

Schools issue predicted grades for sixth-form, A Level and IB applications based on mock performance. If your predicted grade looks higher or lower than the boundary maths suggests, raise it with your teacher early.

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Edexcel IGCSE Biology grade boundaries by paper component

Edexcel publishes component-level thresholds alongside overall thresholds. Component thresholds are useful when you want to know what an “A standard” performance on Paper 1B specifically looked like in previous series.

Component thresholds typically sit a few marks above or below the equivalent percentage of the overall threshold, depending on how that paper performed in that series. For most students, the overall combined threshold is the number that decides the final grade.

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Edexcel IGCSE Biology grade thresholds: where to find the official numbers

Pearson Edexcel publishes a grade boundaries document for each series shortly after results day. Three reliable routes:

1. Pearson Qualifications website → Support → Marking and grade boundaries → International GCSE.
2. Your school’s exam officer receives the document as part of the results pack.
3. Tutopiya’s grade boundary tracker stores recent published thresholds for reference.

A note on data freshness: the 2026 thresholds for the May/June 2026 series have not been set at the time of writing — they are released on results day in August 2026. Until then, the most useful reference is the most recent published series (typically January 2026 or May/June 2025).

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Common mistakes students make with Edexcel IGCSE Biology grade boundaries

• Using last year’s threshold as a target without margin. If the A* boundary was 152/180 last June, a 152/180 mock score does not guarantee A*. Aim for a buffer of 8–10 marks above the historical threshold.
• Mixing 4BI1 (Edexcel International GCSE) with 1BI0 (Edexcel UK GCSE). They are different qualifications with different paper structures and different threshold tables.
• Comparing 4BI1 thresholds to Cambridge IGCSE Biology (0610). Edexcel and Cambridge International grade independently — A* boundaries differ between the two boards and cross-comparison is misleading.
• Forgetting the grade is set per-series. January and May/June within the same year have separate thresholds.

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Edexcel IGCSE Biology revision: from threshold to grade

Published thresholds tell you the destination. The route is the same set of evidence-based revision habits:

• Past-paper Paper 1B timing practice. Sit a full Paper 1B in 2 hours, marked against the official mark scheme, at least once a fortnight in the final eight weeks. Use the past paper exam timer to enforce timing.
• Topic-by-topic confidence rating. Use the Edexcel IGCSE Biology revision checklist to mark your confidence in each syllabus topic. Spend the most time on amber and red topics.
• Extended-response practice. Edexcel rewards detailed extended responses with linked content. Drill the 6-mark questions specifically — they are where many otherwise strong candidates lose marks.
• Definition and command-word precision. Examiners reward the exact wording. Revise the Edexcel command words — describe, explain, suggest, evaluate — and the keyword definitions Edexcel expects.

For broader Edexcel IGCSE Biology preparation, see our Edexcel IGCSE Biology common mistakes guide.

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Frequently asked questions

What are Edexcel IGCSE Biology grade boundaries?

Grade boundaries are the minimum total raw marks required for each grade (A* to G) in Pearson Edexcel International GCSE Biology 4BI1. Edexcel publishes a table after each series with the overall threshold and component-level thresholds.

What raw mark do I need for an A* in Edexcel IGCSE Biology 4BI1?

The A* threshold has typically required around 82–88% of total marks across recent series, but the exact figure changes every session. Use the Tutopiya grade boundary tracker to check the latest published threshold and convert your raw mark.

Are 2026 Edexcel IGCSE Biology grade boundaries published yet?

No — Edexcel publishes grade thresholds on results day. For the May/June 2026 series, thresholds will be released in August 2026. For revision and target-setting, use the most recent published series as a reference band.

Where can I find the official Edexcel grade boundaries document?

On the Pearson Qualifications website, under Support → Marking and grade boundaries → International GCSE. Your school’s exam officer also holds the document as part of each series’ results pack.

Are Edexcel IGCSE Biology and UK GCSE Biology the same qualification?

No. Edexcel International GCSE Biology (4BI1, A*–G) and Edexcel UK GCSE Biology (1BI0, 9–1) are separate qualifications with different paper structures and different grade scales. Cross-comparison requires the GCSE grade conversion guide.

Why do Edexcel IGCSE Biology boundaries change every series?

Boundaries are adjusted for paper difficulty and cohort performance so that comparable candidates receive comparable grades across series. A harder paper sees the threshold drop slightly; an easier paper sees it rise.

Are Edexcel IGCSE boundaries the same as Cambridge IGCSE Biology boundaries?

No. Edexcel (4BI1) and Cambridge International (0610) IGCSE Biology have separate thresholds, separate paper structures and separate mark totals. Cross-comparison is misleading.

Does Paper 1B or Paper 2B matter more for the A*?

Paper 1B carries 110 marks (61% weight) and Paper 2B carries 70 marks (39% weight). The A* is decided largely by Paper 1B performance, but a strong Paper 2B can lift a borderline A candidate into A*.

What happens if I miss the A* boundary by one mark?

Edexcel does not round up. A candidate one mark below the A* threshold is awarded A. Reviews of marking can be requested through your school exam officer if you believe a paper has been mis-marked.

How accurate is the Tutopiya grade boundary tracker?

The tracker uses published Pearson Edexcel grade thresholds for past series and is for reference only. The 2026 thresholds will be set after the May/June 2026 series. For confirmed boundaries, always check the official Edexcel document.

Does the January series have different boundaries from May/June?

Yes — Edexcel sets separate thresholds for each series. January cohorts and May/June cohorts can differ in size and ability profile, which can shift the threshold by a few marks even in the same academic year.

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Last reviewed: 29 April 2026. Pearson Edexcel grade thresholds are released on results day for each series. Always verify current boundaries on the official Pearson Qualifications website or with your school exam officer.

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