The New England Journal has launched a series of interactive cases. Each case presents an evolving patient history and a series of questions and exercises designed to test diagnostic and therapeutic skills.
The tests are free to register for and will provide immediate feed back on your answers. Progress can be saved so you can leave it and return to carry on work at a later date.
A link at the end of the case leads to a CME examination; you can claim up to 2 hours of AMA PRA Category 1 Credit™ for participating.