May I recommend the NCERT math textbooks used in India. They are simple to follow and nicely organized as different levels. They are available for free on the N

May I recommend the NCERT math textbooks used in India. They are simple to follow and nicely organized as different levels. They are available for free on the NCERT website (website maybe a bit tough to navigate). The books cover stuff from basic algebra, geometry and calculus. After this you should be good to go for collegiate mathematics like analysis, multivariable calculus etc.