A correct reader can still be marked wrong when two options are supported by the text. TestFix Lab shows how to find that defect, repair the task and check what the edit changed.

Work through 30 original English-assessment cases. Each contains the flawed task, a diagnosis tied to learner impact, a usable repaired version, the reasoning behind it and a specific next check. Cases cover answer design, reading evidence, listening administration, writing and speaking prompts, rubric boundaries, scoring weights and missing evidence.

For example, TF01 keys Jo as the answer even though “Both” supports Jo and Amir. The repair changes the question to the printed-samples detail. The explanation checks every alternative instead of simply changing the key.

Your download includes: • A 35-page casebook with clickable navigation. • All 30 cases in an editable 31-page DOCX. • An XLSX workbook for case practice and review of up to 50 of your own tasks. • A self-contained offline practice lab: write your diagnosis, repair and next check before revealing the reference; save and export notes. • Five deeper guided walkthroughs with PDF transcripts and optional local browser narration. • A quick-start guide and both licence texts.

Start with one case in 15 minutes. Use the pack for professional development, content-review practice or an internal workshop.

Choose Individual ($59) for one named user, or Team ($179) for up to five named staff in one organisation. Both options deliver the same files; the selected option sets your usage rights. Adapted tasks may be used in your own teaching under the included licence.

Original fictional training material. No test validation, CEFR difficulty, independent reviewer sign-off or personalised marking is included. Walkthrough narration depends on local device voices; these are not recorded audio lessons. Release 1.0.