998 four-choice questions (2 per lesson), written from each lesson's own text, worked example and the book's extracted problem. Mostly grades 3, 6, 7 (books imported before us), plus 4, 5 and a few in 8-12. Hands-on lessons (drawing, measuring, folding) got text questions that test the same idea. Checked: structure (4 distinct choices, no LaTeX), a blind re-solve of all 998 against the key (no mismatch), and content.tests_seed_content seeding the full file. Not checked: an independent second solver. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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