I'm reading 'Lectures on Probability Theory and Mathematical Statistics' by Marco Taboga. It's a ~600 page book comprised of ~75 lectures on various topics in probability and statistical inference. What I like about it is that the lectures are about key topics and are condensed, so it's basically a refresher on important topics and a reminder that they exist. You can always read the chapter and supplement the reading with wikipedia. Additionally, there are solved practical problems at the end of every chapter so you're not just reading about theory, you need to put it into practice. You can find the .pdf online for free since it started as a web textbook, or you can do as I did and buy a hardcopy on Amazon for like, $12.
