# Decision Mathematics 1 (WDM11) past papers > Browse 16 Edexcel IAL Decision Mathematics 1 (WDM11) past papers with question counts, marks and difficulty measures, each linking into the Interactive Practice Hub. - Canonical HTML: https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/ - Markdown mirror: https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/index.md --- Edexcel IAL · Mathematics 16 Edexcel IAL Decision Mathematics 1 (WDM11) papers from 2019 to 2026. Open any paper to see its question list, topics and marks, plus its five difficulty and complexity measures, then start it in the Interactive Practice Hub. - [Browse all papers](https://www.examsci.com/papers) - [Open latest paper](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2026-january-wdm11-01/) ## All D1 papers Difficulty Measure is a mark-weighted average of the part-level difficulty tags on the 0.20–0.75 scale. [How the measure is calculated →](https://www.examsci.com/guides/difficulty-and-complexity-measures/) | Paper | Questions | Marks | Difficulty Measure | Practice | | --- | --- | --- | --- | --- | | [**January 2026** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2026-january-wdm11-01/) | 8 | 75 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=fbdffc15-80a9-4ef6-a258-70b2de564454&source_detail=WDM11%2F01+January+2026) | | [**January 2026** WDM11/02](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2026-january-wdm11-02/) | 7 | 75 | 0.44 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=920b7e07-f16f-4268-9cc4-a78b8d69695b&source_detail=WDM11%2F02+January+2026) | | [**June 2025** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2025-june-wdm11-01/) | 8 | 75 | 0.37 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=f36eb865-2514-4425-97dd-557be92cdc53&source_detail=WDM11%2F01+June+2025) | | [**January 2025** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2025-january-wdm11-01/) | 8 | 75 | 0.42 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=0bc76cc1-87ae-43ea-a146-57a7a6dba481&source_detail=WDM11%2F01+January+2025) | | [**June 2024** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2024-june-wdm11-01/) | 7 | 75 | 0.47 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5f0aa5fd-c7bb-4e39-81fd-cbd20af9b1d9&source_detail=WDM11%2F01+June+2024) | | [**January 2024** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2024-january-wdm11-01/) | 7 | 75 | 0.43 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=04198801-9090-4180-bd96-a7429907030c&source_detail=WDM11%2F01+January+2024) | | [**June 2023** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2023-june-wdm11-01/) | 8 | 75 | 0.46 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a8b13420-afbe-4042-b169-c5d00a5ed804&source_detail=WDM11%2F01+June+2023) | | [**January 2023** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2023-january-wdm11-01/) | 6 | 75 | 0.39 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=3c02abf8-e17d-4306-b90f-31e5e88bee92&source_detail=WDM11%2F01+January+2023) | | [**June 2022** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2022-june-wdm11-01/) | 7 | 75 | 0.44 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6d2516b9-e244-468a-b2b6-b68d2e2732b5&source_detail=WDM11%2F01+June+2022) | | [**January 2022** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2022-january-wdm11-01/) | 7 | 75 | 0.40 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b43cff04-c4b6-4b09-88d8-716f728cfe81&source_detail=WDM11%2F01+January+2022) | | [**October 2021** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2021-october-wdm11-01/) | 7 | 75 | 0.46 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=3b72b234-d813-43f7-ab5b-d39a65544d8e&source_detail=WDM11%2F01+October+2021) | | [**June 2021** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2021-june-wdm11-01/) | 7 | 75 | 0.43 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bec64d2e-ca11-4613-8f1c-8f729d5c455c&source_detail=WDM11%2F01+June+2021) | | [**January 2021** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2021-january-wdm11-01/) | 7 | 75 | 0.39 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=363e19a8-8c35-4a93-9d87-88a35378536f&source_detail=WDM11%2F01+January+2021) | | [**October 2020** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2020-october-wdm11-01/) | 8 | 75 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=c25b7eef-6a17-4099-ae04-28b44359a5bf&source_detail=WDM11%2F01+October+2020) | | [**January 2020** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2020-january-wdm11-01/) | 7 | 75 | 0.45 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e10d26ce-a57a-4414-85a8-df4e5d25bcd9&source_detail=WDM11%2F01+January+2020) | | [**June 2019** WDM11/01](https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/2019-june-wdm11-01/) | 6 | 75 | 0.43 Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=015134b0-982e-4d20-9d99-439657752b32&source_detail=WDM11%2F01+June+2019) | ## Topics assessed in this unit Topic pages collect matching questions across multiple papers. - [Algorithms on graphs II 99](https://www.examsci.com/topics/edexcel-ial/mathematics/decision-mathematics-1-wdm11/algorithms-on-graphs-ii/) - [Critical path analysis 98](https://www.examsci.com/topics/edexcel-ial/mathematics/decision-mathematics-1-wdm11/critical-path-analysis/) - [Linear programming 91](https://www.examsci.com/topics/edexcel-ial/mathematics/decision-mathematics-1-wdm11/linear-programming/) - [Algorithms 75](https://www.examsci.com/topics/edexcel-ial/mathematics/decision-mathematics-1-wdm11/algorithms/) - [Algorithms on graphs 68](https://www.examsci.com/topics/edexcel-ial/mathematics/decision-mathematics-1-wdm11/algorithms-on-graphs/) ## Related units - [Mechanics 2 (WME02)](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-2-wme02/) — M2 — 37 papers - [Statistics 2 (WST02)](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-2-wst02/) — S2 — 36 papers - [Mechanics 1 (WME01)](https://www.examsci.com/past-papers/edexcel-ial/mathematics/mechanics-1-wme01/) — M1 — 36 papers - [Statistics 1 (WST01)](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/) — S1 — 36 papers ## D1 past paper FAQ **How many Decision Mathematics 1 (WDM11) papers are available?** There are 16 Edexcel IAL Decision Mathematics 1 (WDM11) papers, covering 2019–2026. The newest paper is Jan 2026. **Are D1 papers free?** Papers from 2020 and earlier are free to read and practise in the Interactive Practice Hub. Papers from 2021 onwards are Pro papers; their metadata is still public. **What is the difference between D1 papers?** Each paper is a separate exam sitting with its own question mix. Use the question counts, marks and difficulty measures to choose a paper that matches the topics you are revising. **Where can I find the D1 mark scheme?** The mark scheme is used for AI marking inside the Interactive Practice Hub. Public paper pages list the questions, topics and marks so you can plan before you start. --- Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/past-papers/edexcel-ial/mathematics/decision-mathematics-1-wdm11/