<p>NRICH is a free problem-solving programme run by the University of Cambridge as part of the Millennium Mathematics Project. The Post-16 section collects problems and resources aimed at students aged 16–19, covering enrichment topics beyond the standard A-level and similar syllabuses under a low-threshold, high-ceiling design philosophy.</p><ul><li>Open to all; the Post-16 hub is tailored for JC, A-level, and IB-level students</li><li>Resources are organised by mathematical topic and linked to the UK A-level curriculum</li><li>Includes the STEP Support Programme — free problem-solving resources for prospective university mathematics applicants</li><li>Live problems invite solutions, with selected submissions published on the NRICH site</li><li>Self-paced and fully free to use</li></ul>