>>12363225Stewart's Precalculus. Chapter 1.
Teaches you the basics, how to operate exponents and to factorize. Make sure to do every single exercise in it, and don't conform with reaching and answer, make sure the answer is correct (do it again, replace the letters with numbers, check backwards step by step). If your answer is wrong, point out Where you made the mistake and what reasoning made you write that. Keep a notebook of mistakes so you identify them quicker and you avoid them in the future.
Also use Anki to write flashcards of the sums and substractions of the digits 1-9, memorize the squares and cubes of said digits and if you want their reciprocals in decimal as well. Do this to train your mental calculation and speed up the amount of exercises you can solve.
