We just released our new Biostats module on CCSQB!
It includes clear explanations of the core biostatistics principles, plus hundreds of practice questions. We have two main types: concept-building questions (these are simpler and meant to help you really understand the material) and realistic questions that are similar to what you’ll actually see on the USMLE. We also added a bunch of Drug Ad interpretation questions, since those show up so often on Step 3.
Hope you find it useful — let us know how it goes!