These resources from Underground Mathematics will help you stretch different parts of your mathematical knowledge.
problem
Mixed bag
Age
16 to 18
Challenge level
A collection of intriguing questions involving logarithms.
list
Finding your feet
Age
16 to 18
Challenge level
Problems to help you get started with higher mathematics courses
list
Underground Mathematics
Age
16 to 18
Challenge level
Check out the new Underground Maths website