I believe that Everybody Codes has a leaderboard where it starts counting from when you first open the puzzle. So if you're looking for coding puzzles with a leaderboard that one would be fair for you.
I hate when I buy an interesting math book and then it's like "oh wait, no solutions." And then I end up going on GitHub hoping for community-worked solutions.
I've been wanting to read books like Algorithms for Optimization (https://www.amazon.com/gp/product/0262039427/) and Probabilistic Machine Learning (https://www.amazon.com/gp/product/0262046822/) but when I open them up I immediately think "wow I really need to refresh my calculus because I have no idea what's going on." It sounds like I should look into Math Academy for relearning old Calculus and learning some new stuff as well.
2. We designed a Mathematical Foundations course sequence specifically for adults who want to get up to speed or relearn math skills they have forgotten as preparation for Mathematics for Machine Learning and other university math courses. More info here: https://www.mathacademy.com/adult-students.
3. When you start on the system we assess not only your knowledge of the course you're placing into, but also lower-level foundational topics. If we detect that you have any gaps in your foundations (most learners do, especially adults who have been out of the game for a while), then we'll automatically add them to your learning plan and make sure you learn them before we give you any more advanced topics that depend on them. More info here: https://www.mathacademy.com/how-our-ai-works#diagnostic-algo...
I think I would enjoy working for a 3 letter agency but the USDS website makes it look like you'll be working on very different types of things. Although I suppose they wouldn't be advertising that work.
I've been using Jupyter Lab for ages now since it had a dark mode and Notebooks didn't. It's been so many years though maybe that has changed by now and I haven't noticed.
https://everybody.codes/events