I studied only at the undergraduate level and most textbooks I had were at a quite basic level. Of the English language textbooks I had, the ones I liked the most were "Calculus: a complete course" by Adams and Essex; "Linear algebra and its applications" by Lay, Lay and McDonald; "Numerical analysis" by Sauer; and "Mathematical statistics with applications" by Wackerly, Mendenhall and Scheaffer. Good explanations, many examples, many exercises with answers provided to most of them.