If you're looking for books, have a look at Schaum's Outline of Precalculus [0]. Khan Academy [1] is also good and there's this MOOC on coursera called Data Science Math Skills [2].

[0] https://www.amazon.com/Schaums-Outline-Precalculus-3rd-Probl...

[1] https://www.khanacademy.org/math

[2] https://www.coursera.org/learn/datasciencemathskills