Mathsnetgcse is a subscription site aimed specifically at intermediate GCSE students. A step-by-step guide to solving more than 1,000 questions on number, algebra, shape and space and data-handling is included - and when you've finished there are also exam papers to try. The B List shows harder topics that need to be understood to achieve a B grade (the highest at intermediate). Subscriptions are pound;350 for a school account, pound;450 for a college or pound;15 for studentteacher (prices exclude VAT). The site is registered for Curriculum Online, so you can pay with eLearning credits.