Searching for IELTS study material turns up an overwhelming mix of free websites, official practice books, mobile apps, and paid courses. Rather than trying to collect everything, it helps to understand what each type of material is actually good for, so you can build a small, effective set of resources instead of a large, unfocused one.
Official practice materials
The official IELTS partners — Cambridge Assessment English, the British Council, and IDP — publish practice materials, including the well-known Cambridge IELTS series of past-paper-style practice books. Their main advantage is authenticity: the passages, question styles, and audio are produced by the same organisation that writes the real test, so they're the closest thing to genuine past papers you can study from. Their main limitation is volume and cost — official books are priced individually and only contain a handful of tests each, which makes them a comparatively expensive way to get large amounts of practice.
Free online practice tests
Free platforms can't claim to be 'official,' but a well-built one replicates the same question types, section structure, and timing as the real test, and does so at a volume that would be expensive to match with official books alone. Free practice is particularly strong for Reading and Listening, where correctness is objective and instant scoring with explanations tells you exactly what you got wrong and why — something official books can't do without a human marker. The trade-off is that free platforms vary enormously in quality; look for ones that use the real IELTS question formats and section timing, not just generic vocabulary quizzes.
Where paid materials still add value
Two areas benefit most from paid or official material: authentic listening audio recorded with native-accent variety similar to the real test, and Writing or Speaking feedback from someone trained on the official band descriptors. If your budget is limited, this is where it's worth spending it — a small number of official listening tests for audio authenticity, and a handful of paid essay or speaking reviews, rather than a full paid course covering everything.
Building a practical resource stack
A sensible combination for most candidates: use free practice tests as your main volume of Listening and Reading practice, since repetition matters most there and instant scoring keeps you moving quickly through material. Reserve any budget you have for Writing and Speaking feedback, since those are the skills self-study struggles to improve without outside input. If you specifically want authentic official audio recordings close to your test date, supplement with one or two official Cambridge listening tests rather than relying on them for your entire preparation.
PrepTest Hub's practice tests are free across all four skills, using the real IELTS question formats and timing, so you can build the high-volume part of your study material stack at no cost and direct any budget you have toward the areas that benefit most from paid feedback.