They say you don’t get something for nothing, but in the case of non-profit website, khanacademy.org they are wrong, because here you’ll find a wealth of knowledge parcelled up in easily digestible videos & exercises completely free of charge. The library has over 2,600 videos covering everything from algebra to venture capital, plus more than 200 practise exercises to help it sink in. As well as the videos there are practise exercises and resources for educators to help them inspire their students. You’ll need to log in with either a Google or Facebook account, and then you can save and track any progress made as well. You can watch the videos without logging in, but students who do can also save their completed activities and post questions & comments against the articles. Most of the content is aimed at middle or upper school students, with a spattering of subjects, such as adding and subtracting, geared towards younger children too.