Khan Academy — free lessons and practice for all ages

Khan Academy is a non‑profit online learning platform offering entirely free lessons, practice exercises and instructional videos across maths, science, computing, economics and school subjects from primary through secondary levels. UK students and adults can create an account at no cost and track progress through personalised learning dashboards and practice exercises; teachers can also use it for classroom support. Access is via the website and apps — everything is free, with optional sign‑in to save progress.