Cambridge writes the IELTS test, so we compared its books; we didn't check other publishers. The best in 2026 are the newest practice tests: IELTS 19, 20 or 21, in the edition for your module (Academic or General Training), with audio, answer keys, sample Writing answers and a Speaking video. For strategy, add The Official Cambridge Guide to IELTS. No book scores your own Writing and Speaking or plans your weeks, so pair it with GoPrep (ours), our recommended companion: AI scoring on the official criteria, a daily plan to your test date and 80+ Academic mock tests per skill in the computer format.
Facts about each book come from Cambridge's descriptions, checked on 30 September 2026.
Already own a Cambridge book? Here is when a new one is worth buying.
| Your situation | Keep and buy | Why |
|---|---|---|
| You have IELTS 12 | Use unseen tests as mocks, done ones for drills. When unseen tests run out, buy IELTS 20 or 21 (IELTS 21 Academic with Answers with Digital Pack: ISBN 9781009826723) | New tests, plus a Speaking video, which the checked editions 11, 12 and 14 don't list |
| You have IELTS 18 | Keep it for full mocks; buy a newer volume once its 4 tests are used | It lists audio, explanations, sample Writing and Speaking videos |
| You have IELTS 20 | Keep it; add IELTS 21 once all 4 tests are used | A new book only adds 4 new tests |
| You need General Training | Buy the General Training edition of IELTS 19, 20 or 21 | Books 9 and 10 have only extra GT Reading and Writing; full GT editions start at 11 |
| No audio (a PDF or used copy) | Check the ISBN and access instructions with Cambridge or the seller; if you can't get the audio, buy an edition that includes it | Listening needs the audio, and access depends on the edition |
| 6 weeks left | Old book for weeks 1 and 2; one new volume for weeks 3 to 6 | 4 unseen tests: one timed mock a week (plan below) |
How to choose an IELTS book: 4 checks
Ignore star ratings and bestseller badges. For IELTS, four things decide whether a book helps.
| Check | What to look for | Why it matters |
|---|---|---|
| Authentic papers from Cambridge, which writes IELTS | Unofficial tests can differ in level and instructions |
| An Academic or General Training edition | Reading and Writing differ |
| Audio, answer explanations, sample Writing answers, a Speaking video | Without them, half the value is gone |
| Who will score your own answers? | A book can't mark yours |
Cambridge IELTS 1 to 21: which volumes are still worth it
Cambridge doesn't publish a list of which volumes match today's format, so we compared the editions below by what Cambridge's descriptions list.
| Volumes | What you get | How to use them |
|---|---|---|
| IELTS 21 (July 2026), 20 (July 2025), 19 (June 2024) | 4 tests in an Academic or General Training edition; audio, answer keys, sample Writing answers, a Speaking video | Your main timed mocks |
| IELTS 15 to 18 | The same extras, with extra answer explanations; recent editions such as IELTS 18 put them in an online Resource Bank | More full mocks |
| Cambridge IELTS 11, 12 and 14 | Separate Academic or General Training editions; answers, tapescripts, model and sample Writing answers. No Speaking video listed | Extra practice tests |
| Cambridge IELTS 9 and 10 | 4 Academic tests plus "extra Reading and Writing modules" for General Training | Extra practice: Academic tests, plus GT Reading and Writing |
| Cambridge IELTS 1 to 8, and 13 | Not checked | Check the contents before you rely on them |
Why start from the newest: some 2026 forum posts say older volumes feel harder or different, and we found no official list of changes. Keep the newest book for final mocks. Unsure of your module? See Academic vs General Training.
The Official Cambridge Guide and skill books
Practice tests check you. These books teach you, and three of them target a level.
| Book | What Cambridge's page lists | Best for |
|---|---|---|
| The Official Cambridge Guide to IELTS (2025 edition) | 8 official practice tests, the first guided; every question type; both modules; from band 4.0 | Learning each question type, then testing |
| IELTS Trainer 2 | 6 practice tests, the first two guided; Academic or GT editions; extra language practice | Guided practice before full mocks |
| IELTS Grammar and IELTS Vocabulary, bands 6.5 and above | Grammar: an entry test to find weak areas. Vocabulary: exercises for all four skills, with progress checks | Language gaps once you aim for 6.5+ |
| IELTS Common Mistakes, bands 5.0 to 6.0 and 6.0 to 7.0 | "Based on analysis of thousands of real exam scripts", with unit tests | Fixing the errors that cap your band |
Buy the book: the legal route
Cambridge sells these books through its shop and booksellers. A full scan of a commercial book shared without the publisher's permission is not a legal copy, and it doesn't give you the online audio and Resource Bank that come with editions that include them.
Free and legal: Cambridge's paper sample tests on the same page, and the ielts.org sample questions with answer keys and model answers.
How to use a book test as a timed computer mock
IELTS is moving to computer delivery from mid-2026, with dates that vary by country and Writing on Paper where available; check the format when you book. Your book is on paper, but you can rebuild computer conditions:
- Learn the screens once. Open the free practice experience on ielts.org. Its tests are "not timed", so they teach the layout, not the pace.
- Listening, 30 minutes. Play each part once, without pausing, and type answers as you hear them. On computer there is no 10-minute transfer, only 2 minutes to check (IDP).
- Reading, 60 minutes. Type these too: there is no extra time to copy.
- Writing, 60 minutes for both tasks. Type with spell-check off and the word count visible.
- Speaking, 11 to 14 minutes. Have someone ask the book's Part 1 to 3 questions, or record yourself.
- Mark strictly. In Listening and Reading, mark against the key: a misspelling is wrong, and so is an answer over the task's word limit. Convert with the book's scoring guidance.
Cambridge's own teachers' blog warns against "treating practice tests as predictions rather than diagnostic tools".
Are Cambridge books easier than the real test?
We read 2026 posts on r/IELTS, a large IELTS forum on Reddit. Of 11 exam reports that compared the real test with Cambridge books, 7 said the real test felt harder, 3 easier and 1 about the same. This is self-reported and rough, not official data.
Cambridge says every part of its recent books is "tested with real students under exam conditions". If your book scores still run higher, check the usual causes:
- You mark yourself gently. In the real test a missing plural "s" or a spelling slip costs the mark: see Listening spelling rules.
- No real pressure. Pauses and extra time can inflate a practice score. If you sit the test on computer, also practise reading on screen and typing answers.
- You have seen the text before, from an earlier attempt or a friend's book.
- One mock shows one attempt. Of 86 GoPrep learners with 4 or more full mock exams (all four skills 4.0 or higher, 15 July to 26 September 2026), 53 had a full band or more between their best and worst overall result (Writing and Speaking scored by the GoPrep AI examiner). Judge your level on several timed tests, not one.
Mock scores jumping around? Name your weakest skill in a short quiz and get a GoPrep plan built around it.
Where books fall short: Writing and Speaking
A book shows sample answers but can't score your own essay or recording. Cambridge's blog itself calls Writing the part teachers find most difficult to help with when using practice tests.
That gap often sits on your weakest skill. In 727 first full mock exams on GoPrep (28 July to 26 September 2026, all four skills 4.0 or higher), the weakest skill was Writing in 43%, Listening in 42%, Reading in 36% and Speaking in 15% (ties count for each skill; Writing and Speaking were scored by the GoPrep AI examiner).
Your options: a teacher who marks against the public Writing and Speaking criteria, a study partner for Speaking, or an AI platform.
Good Listening and Reading scores, the parts a book can mark, don't close this gap. Of 155 first full mock exams on GoPrep with Listening and Reading both 6.5 or higher (same period and scoring), 52 (34%) had Writing or Speaking below 6.0: Writing in 45 (29%), Speaking in 9 (6%).
Our pick to go with your book: GoPrep
GoPrep is the platform behind this guide (ours), and it does what a book can't. GoPrep won EdTech Project of the Year at the AI & Digital Bridge Awards 2026 in Astana and has 40,000+ users in 140 countries. On GoPrep so far: 516,000+ mock tests and practice sessions taken, and 188,000+ essays and spoken answers checked by AI.
- Writing and Speaking scored by AI: Writing on the four official criteria (TA or TR, CC, LR, GRA) in half-band steps; Speaking with a transcript plus fluency, vocabulary, grammar and pronunciation.
- An adaptive daily plan to your test date, with error review of your answers.
- 80+ mock tests per skill for Academic in the computer format, typed on screen; Listening and Reading also by section. For General Training: 37 Reading and 21 Writing tests.
- Vocabulary with spaced repetition and Preppy, a voice AI tutor for Speaking practice.
- Add-ons: Crusher for all skills and Grammar Maxxing.
- iPhone app plus the web version in any browser, with a Russian and Uzbek interface on the website.
How they fit: the book gives authentic Listening and Reading tests and model answers; GoPrep scores your Writing and Speaking and runs the plan. The quiz gives you the plan; mocks and AI scoring come with a subscription.
GoPrep's Score Guarantee: if your overall IELTS band doesn't rise by at least 1.0, you get 100% of your subscription back, provided you meet the conditions (an official TRF of 6.5 or lower, at least 3 months of subscription, and the full practice plan).
Start preparing for IELTS today: tell GoPrep your target and test date in a short quiz and get a plan for every day until the exam.
Still choosing your exam? Compare IELTS, TOEFL and Duolingo. Beyond books, see the best IELTS preparation websites and how to read an IELTS mock test score.
Practice: plan six weeks with books
Dilnoza takes IELTS Academic in 6 weeks and needs 6.5. She owns Cambridge IELTS 12; a friend offers a PDF of IELTS 20. Last book test: Listening 7.0, Reading 6.5. Nobody has marked her Writing or Speaking. What should she do?
Our answer (an example plan, not the only way): buy IELTS 20 or 21 Academic, with its audio and keys, instead of using the PDF. Its 4 tests become her weeks 3 to 6, so she never repeats a test, and IELTS 12 covers the diagnostic. GoPrep scores Writing and Speaking on its own tasks; to get the book's Writing tasks marked, she needs a teacher.
| Week | Book work | Writing and Speaking scored in GoPrep |
|---|---|---|
| 1 | IELTS 12, one full test, all four skills | A Writing mock (Task 1 and 2) and a Speaking mock: her starting bands |
| 2 | Review every error; drill weak Listening and Reading question types by section | Practice on her lowest Writing and Speaking criteria |
| 3 | IELTS 20 or 21, Test 1: full, timed, typed | Writing Task 1 and 2 and a Speaking mock, scored |
| 4 | Test 2 | The same; compare criteria with week 3 |
| 5 | Test 3 | The same |
| 6 | Test 4, 5 to 7 days before the exam | A last Writing and Speaking mock |
Less than 8 weeks to your exam? Get a GoPrep plan for the time you have.
Check yourself
FAQ
Which Cambridge IELTS book is best?
The newest one for your module: IELTS 21, 20 or 19, Academic or General Training, with audio, answer keys, sample Writing answers and a Speaking video.
Are Cambridge IELTS books enough to prepare?
For Listening and Reading, a recent Cambridge book with strict timing goes a long way. It won't score your Writing or Speaking, so add a teacher or an AI tool that marks against the official criteria, such as GoPrep (ours).
Are Cambridge IELTS books easier than the real test?
Cambridge says its recent tests are tested with real students under exam conditions. Of the 2026 test-taker reports we read, more said the real test felt harder.
Can I download Cambridge IELTS books as free PDFs?
Not legally. The free official options are Cambridge's paper sample tests and the sample questions on ielts.org.
Our verdict
Pick one recent Cambridge book for your module and schedule a timed mock every week. For what the book can't do, scoring your Writing and Speaking, full computer-format mocks and a day-by-day plan, our pick is GoPrep. Tell GoPrep your target, test date and hardest skill in a short quiz and get your personal plan.
GoPrep Team
GoPrep guide authors
We write about IELTS preparation using platform data and official exam materials.
All articles by GoPrep Team