Khan Academy — free lessons for school and adult learners

Khan Academy provides comprehensive, free, curriculum-linked lessons in maths, science, computing and humanities aimed at school-aged learners and adult learners alike. UK residents can create a free account to access practice exercises, instructional videos and personalised learning dashboards; teachers and parents can set up class groups at no cost. Access is through the Khan Academy homepage — content is free to use and suitable for self-study or classroom support.