The Art of Problem Solving: https://artofproblemsolving.com/store/book/aops-vol1 https://artofproblemsolving.com/store/book/aops-vol1 Yes, it is targeted towar

The Art of Problem Solving: https://artofproblemsolving.com/store/book/aops-vol1 https://artofproblemsolving.com/store/book/aops-vol1 Yes, it is targeted towards middle and high school students. Yes, I read it and (more importantly) worked through most of the problems in my mid-30's. It is great if, like me, you coasted/crammed through your early mathematics education and never felt like you dialed in the fundamentals. It is also great if, like me, you needed some pen-on-paper practice and did not know where to start.