2 books that are worthwhile: "A mathematical bridge" (an introduction to the lie of the land in higher math) and "Chapter Zero" (a review of material not taught

2 books that are worthwhile: "A mathematical bridge" (an introduction to the lie of the land in higher math) and "Chapter Zero" (a review of material not taught in school, but wich is so basic that most textbooksjust assume you know, e.g. bijections and proof by induction)