Edexcel IAL Biology AS + A2

Edexcel IAL Biology Notes

Two books, six units, one system — AS Units 1–3 and A2 Units 4–6, each written against the mark scheme.

The IAL is modular, so these notes are too: an AS book for Units 1–3 (WBI11–WBI13) and an A2 book for Units 4–6 (WBI14–WBI16). Best value is the four-book A-Level bundle across both subjects — or buy the stage you are sitting.

See the best-value bundle — $60

See inside the book

Digital eBooks · Instant online access · Phone, tablet and computer · Updated when the syllabus changes

Edexcel IAL AS Biology (Units 1–3) and A2 Biology (Units 4–6) Complete Notes eBooks tied together with a gold gift ribbon

20,000+ copies sold in 2025 40+ countries 21+ years teaching 5 published textbooks

Is this the right book for you?

Board: Edexcel International A Level
AS book: Units 1–3 · WBI11–WBI13
A2 book: Units 4–6 · WBI14–WBI16
Structure: Buy per stage or full A Level

AS students need the Units 1–3 book; A2 students need Units 4–6; full A Level uses both. Not your syllabus? Use the book finder.

Best value $60 $100 Save $40

Four-book A-Level bundle — all four Biology and Chemistry books (AS + A2, six units each subject) for the biggest saving.

Get all four books — $60

See all options

Built for a modular exam

The IAL is examined unit by unit — so revise unit by unit

Trying to revise all of A Level Biology at once is why students feel overwhelmed. These notes match the unit structure of the exam exactly, so each book maps to the papers you actually sit.

Pick your stage

AS book for Units 1–3, A2 book for Units 4–6 — no paying for content you are not examined on yet.
Learn per unit

Each unit is written in mark-scheme language, so answers transfer straight to the paper.
Connect the ideas

Topic maps link concepts across units for the synoptic thinking A2 rewards.
Recall under pressure

Flashcards and quizzes turn dense content into answers you can retrieve in the exam.

Built for the exam

What makes these IAL Biology notes score

Organised by unit

Content follows WBI11–WBI16 exactly, so revision maps to the papers you sit.

Mark-scheme language

Every definition and explanation written the way IAL examiners award it.

Data & practical thinking

The data-analysis and practical skills IAL papers test, worked through in context.

Synoptic topic maps

Links across units for the connected thinking A2 demands.

Quizzes

Past-paper-style questions per unit to test application, not just recall.

Current specification

Matched to the current Edexcel IAL Biology specification and revised on change.

See inside

Watch the walkthrough, then flip the pages

Sample — AS Biology (Units 1–3)

Sample — A2 Biology (Units 4–6)

Get your copy

Best value: all four books — or choose your Biology stage

Doing the full A Level across both subjects? The four-book bundle saves the most. Doing Biology only? The AS + A2 pair covers all six units. Or buy just the stage you are sitting.

All four Edexcel IAL Biology and Chemistry Complete Notes eBooks (AS and A2) tied together with a gold gift ribbon

Best value Save $40

Four-book A-Level bundle

All four AS + A2 books across Biology and Chemistry — twelve units in one purchase.

AS Biology — WBI11–WBI13
A2 Biology — WBI14–WBI16
AS Chemistry — WCH11–WCH13
A2 Chemistry — WCH14–WCH16

$60 $100 Save $40

Get all four books — $60

Edexcel IAL AS Biology and A2 Biology Complete Notes eBooks tied together with a gold gift ribbon

Full A-Level Biology Save $10

AS + A2 Biology pair

Both Biology books — all six units (WBI11–WBI16) for the complete A Level.

AS Biology — Units 1–3 (WBI11–WBI13)
A2 Biology — Units 4–6 (WBI14–WBI16)

$40 $50 Save $10

Get both Biology books — $40

Or buy a single Biology stage

Edexcel IAL AS Biology Complete Notes eBook (Units 1–3) shown on a laptop and tablet

WBI11–WBI13

AS Biology — Units 1, 2 & 3

Molecules & transport, cells & development, and the practical skills paper — written for AS.

$25

Covers the three AS units.

Get the AS book — $25

Edexcel IAL A2 Biology Complete Notes eBook (Units 4–6) shown on a laptop and tablet

WBI14–WBI16

A2 Biology — Units 4, 5 & 6

Ecosystems & energy, respiration & the nervous system, and the practical skills paper — written for A2.

$25

Covers the three A2 units.

Get the A2 book — $25

Format:: eBook — phone, tablet and computer
Access:: online, straight after purchase
Updates:: revised when the specification changes

Edexcel IAL AS Biology Units 1–3 classified past papers 2019–2026

OPTIONAL COMPLETE COURSE

Need full teaching for Units 1–3?

The eBook is a complete standalone revision resource.

The selected eBook is a complete standalone revision resource. The AS Biology course adds video lessons, solved past papers, practical-unit preparation, quizzes, progress tracking and structured exam guidance.

Full AS video lessons
Solved past-paper practice
Unit 3 practical preparation
Two years of access

Explore the AS Biology Course

Your eBook remains a complete resource. The course is an optional additional level of teaching and support.

IAL Biology students

What IAL Biology students report

IAL AS Biology

“I haven’t opened my textbook once this year. Everything I need for WBI11 and WBI12 is already in these notes — written concisely, in the exact language the mark scheme rewards.”

Khalid Al-Otaibi · Saudi Arabia

IAL A2 Biology

“The notes are so short and precise that I learned concise phrasing that matches the mark scheme perfectly. I got an A* in WBI14 and these notes were the only resource I used.”

Thanyarat Srisawat · Thailand

Full A-Level Biology

“I bought the full AS + A2 bundle and it covered all six units in one place. The flashcards and quizzes helped me retain everything, and the notes are so concise I never looked anything up elsewhere.”

Chan Tsz Ying · Hong Kong

IAL A2 Biology

“A2 Biology has so many connected ideas, but the maps helped me bring the units together instead of revising each topic in isolation.”

Xavi Fontanet · Spain

IAL AS Biology

“I bought these three weeks before my AS exams. They are regularly updated and completely replace the textbook — exactly what I needed.”

Léa Favre · Switzerland

Hosni, the science author and examiner who writes the Chem-Bio eBooks

Written by Hosni

Edexcel IAL Biology is taught in these books by the same teacher who wrote them: 21+ years teaching these exact syllabuses, 9 years writing the books, 5 published textbooks — and 20,000+ copies sold yearly across 40+ countries.

Before you choose

Edexcel IAL Biology questions

If you are sitting Units 1–3 (WBI11–WBI13) this year, get the AS book. If you are sitting Units 4–6 (WBI14–WBI16), get the A2 book. For the full A Level you need both.

No — the IAL is modular, so it is split into an AS book (Units 1–3) and an A2 book (Units 4–6). This keeps each book focused on the papers you actually sit.

Yes. Each book covers its three units in full, exam-focused form. Many students use them as their only Biology resource.

Yes. Both books include flashcards and past-paper-style quizzes for active recall, plus topic maps for synoptic links.

Yes — matched to the current Edexcel IAL Biology specification and revised whenever it changes.

The complete Biology collection covers WBI11, WBI12 and WBI13 at AS level and WBI14, WBI15 and WBI16 at A2 level. Unit-based organisation allows students to purchase and study the part of the qualification they are currently completing.

Students can choose the option that matches their current stage, subject to the purchase choices displayed on the page. This avoids paying for units that are not yet required while allowing students who want one consistent system to obtain the complete set.

Where individual-unit options are available, students can select the exact WBI unit they need. This can be useful for a resit, a particular examination session or a student who already owns some of the books.

The notes organise complex ideas into concise, logical sequences and connect them to mark-scheme language. Students are shown which details must be included and how an extended answer can be built without filling it with unrelated information.

Yes. Students practise moving from a graph or table to a valid description, comparison, calculation and biological conclusion. The guidance also helps them distinguish between what the data directly shows and what may only be suggested by the evidence.

Practical thinking is integrated throughout the relevant units. Students work with variables, controls, reliability, validity, uncertainty and evaluation so they can reason through unfamiliar investigations rather than memorising one standard method.

Extended responses are broken into their essential components. Students learn how to identify the topic, organise the biological sequence, include precise terminology and check that every sentence contributes to answering the question.

The concise notes are supported by flashcards, quizzes and study guidance where indicated. These resources encourage repeated active recall, which is more useful than highlighting pages or repeatedly reading the same information.

Yes. Each unit provides an organised route through the required content, reducing dependence on rushed handwritten notes or disconnected presentation slides. Students can identify gaps and rebuild their understanding before attempting complete papers.

No. They make past papers more valuable. Students first learn the content and answer structure, then use questions to test application. When they lose marks, they can return to the exact explanation, keyword, graph skill or practical principle that caused the problem.

Access is available for two years from the date of purchase for the Biology option purchased. This gives students time to study the relevant units, revisit earlier content and use the resource during revision and resit preparation within the access period. ---