Write revision content for my website

I run a revision website and seek to hire good writers who are passionate about their subject to write content for me. the content must be high quality and easy to digest for GCSE and A level students. I will pay £10 per high quality page of website content (must be 700+ words per page) I am open to ideas of which subjects to cover, but currently would like to cover history, geography, economics, maths, business and accounting. If your content is good it is likely i will comission more work.