<p>A free, self-paced Precalculus course from Khan Academy covering functions, trigonometry, complex numbers, vectors, matrices, and conic sections. The material maps closely onto topics in H2 Math and A-Level preparation for Singapore students.</p><ul><li>Ten units spanning 131 skills, including composite and inverse functions, trigonometry, complex numbers, rational functions, conic sections, vectors, matrices, probability and combinatorics, series, and limits</li><li>Delivered as short instructional videos, written articles, and mastery-based practice exercises</li><li>Course Challenge and unit tests are available to gauge readiness for calculus</li><li>Free to use with no account required to browse; an account unlocks personalised progress tracking</li><li>Best for Sec 4 through JC2 students looking to reinforce or extend their school syllabus</li></ul>