Khan Academy — free lessons and practice across school and adult topics

Khan Academy is a free online learning platform offering video lessons, practice exercises and instructional articles across maths, science, computing, history and more, aimed at learners of all ages from primary school to adults. Content is freely available worldwide with no cost to access; creating an account enables progress tracking and personalised practice, but you can also browse many lessons without signing in. UK residents can use Khan Academy to support school learning, revise for exams or build foundational skills at no charge by visiting the site.