For preparing as a Mathematics teacher from Class 1 to 10, the best books to buy are NCERT textbooks, as they are the standard across CBSE and many state boards. For Classes 1–5, NCERT publishes titles like Joyful Mathematics, and for Classes 6–10 the regular Mathematics textbooks are used. You can also add NCERT Exemplars for extra practice. If you want detailed practice, reference books like R.D. Sharma (Dhanpat Rai Publications) or Scorer Guru are also useful. These books are available in most bookstores and online (Flipkart, Amazon, Meesho, NCERT website). This set will fully prepare you for the coming academic year.