I would like to call your attention to a couple of new resources I have posted.
Firstly, if you are looking for practice problems, the AMC has worksheets and topical quizzes posted on-line for free. I have also posted a link to a site which has past AMC 8 and AMC 10 exams with solutions.
Secondly, I have posted links to The Mathsters videos on Youtube. The Mathsters is series of short video lectures introducing “proper” mathematics starring Dr. Eugenia Cheng of the University of Sheffield, UK. These are aimed at 16-18 year olds who want to stretch themselves towards undergraduate level mathematics, and interested adults who have little or no experience of formal mathematics. Dr. Cheng is a dynamic and engaging speaker. She has a rare gift for making complex mathematical topics clear and approachable. I wish I’d had a teacher like her as an undergraduate. Her enthusiasm for mathematics shines!
You can find both of these under the “Resources” tab in the menu above. Enjoy!