120点満点の CAT 形式 IELTS 模試。直前の正誤に応じて次問の難易度がリアルタイム調整され、実際の IELTS CD 形式と同様に出題。Reading と Listening が中心、Speaking と Writing は追加モジュール。提出直後に推定バンドスコアを確認できます。
The IELTS Computer-Adaptive mock test, also called IELTS CAT, mirrors the increasingly common computer-delivered IELTS format with one key extension: the difficulty of each question adapts in real time to your previous answers. Get a question right and the next one is harder; get it wrong and the next one is easier. This produces a tight estimate of your true ability in far fewer questions than a fixed-length test.
A fixed 80-question mock spends most of its questions far below or above your level — wasted information. CAT concentrates questions near your estimated band, so 30 adaptive questions can pin your Band Score within ±0.5 with the same statistical confidence as 80 fixed questions. This is the same logic behind computer-adaptive tests like GRE and TOEFL iBT.
Each Reading and Listening item carries a difficulty rating (1–9 band-aligned). The CAT engine updates a running ability estimate after every answer using a 1-parameter Rasch model. When the standard error of measurement drops below 0.3 bands, the section ends. The final ability estimate is then converted to the official IELTS Band using the published raw → band table.
The real IELTS computer-delivered test is currently fixed-length (40 Reading + 40 Listening); the adaptive engine here is for diagnostic accuracy, not for replicating the exam's question-count exactly. Use CAT to triage which module needs work, then use the full-length mock test to rehearse pacing and stamina.
You receive a per-module band, the Overall Band rounded by the official .25 / .75 rule, a difficulty-vs-accuracy chart, and a list of the question types you missed most. Wrong answers are pushed into the Ebbinghaus review schedule (1, 3, 7, 14, 30, 60 days) so retesting the same weakness happens at the optimal forgetting interval.
Power IELTS — power-ielts.com