| # Schema |
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| The authoritative dataset file is `full.parquet`. It contains 3,887 rows and 21 columns. |
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| | Column | Type | Description | |
| | --- | --- | --- | |
| | `id` | string | Stable item identifier. | |
| | `year` | string | Competition year. | |
| | `group` | string | Grade bucket: `3-4`, `5-6`, `7-8`, `9-10`, or `11-13`. | |
| | `language` | string | Item language; currently `de`. | |
| | `points` | int32 | Official item value: 3, 4, or 5. | |
| | `problem_number` | string | Problem number within the exam. | |
| | `problem_statement` | string | OCR-corrected problem statement text. | |
| | `answer` | string | Gold multiple-choice answer label: `A`, `B`, `C`, `D`, or `E`. | |
| | `multimodal` | bool | Whether the item contains a question image or image-based answer option. | |
| | `sol_A` | string/null | Text for answer option A when available. | |
| | `sol_B` | string/null | Text for answer option B when available. | |
| | `sol_C` | string/null | Text for answer option C when available. | |
| | `sol_D` | string/null | Text for answer option D when available. | |
| | `sol_E` | string/null | Text for answer option E when available. | |
| | `question_image` | bytes/null | PNG bytes for the question crop or visual stem. | |
| | `sol_A_image_bin` | bytes/null | PNG bytes for graphical answer option A. | |
| | `sol_B_image_bin` | bytes/null | PNG bytes for graphical answer option B. | |
| | `sol_C_image_bin` | bytes/null | PNG bytes for graphical answer option C. | |
| | `sol_D_image_bin` | bytes/null | PNG bytes for graphical answer option D. | |
| | `sol_E_image_bin` | bytes/null | PNG bytes for graphical answer option E. | |
| | `associated_images_bin` | list | Additional associated PNG image payloads where applicable. | |
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| Image fields are stored directly as binary payloads. Text answer fields may be null when the corresponding answer option is graphical. |
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