At Math Academy (https://mathacademy.com), we created a series of courses, Mathematical Foundations I, II, & III, that will take a student from basic arithmetic through calculus and prepare them for university-level courses like Linear Algebra, Multivariable Calculus, Probability & Statistics, etc. You can jump in at any with an adaptive diagnostic that will custom fit the course to you based on your individual strengths and weaknesses.

https://mathacademy.com/courses/mathematical-foundations-i https://mathacademy.com/courses/mathematical-foundations-ii https://mathacademy.com/courses/mathematical-foundations-iii

We also have courses on Linear Algebra and Mathematics for Machine Learning:

https://mathacademy.com/courses/linear-algebra https://mathacademy.com/courses/mathematics-for-machine-lear...

It's not free, but our adaptive, AI-driven algorithms makes it the most efficient way to learn math that you're going to find. We've had numerous students master 3-5 years of math in a single year.

We're still in beta and haven't done a proper Show HN yet, but we're getting there!

I'm the founder, so I'd be happy to answer any questions.

I think you might like my book "No Bullshit Guide to Math & Physics"[1,2,3], which contains a condensed review of high school math (a.k.a. algebra and precalculus), then explains PHYS and CALC topics in an integrated manner.

[1] website https://minireference.com/ [2] PDF preview and sample chapter = https://minireference.com/static/excerpts/noBSmathphys_v5_pr... [3] concept map = https://minireference.com/static/conceptmaps/math_and_physic...

If you prefer something focussed on a review of high school math topic, then you might prefer the "green book" instead, see https://nobsmath.com/

It's not one book, but for everything before calculus it would be difficult to beat the books in Israel Gelfand's High School Mathematics Correspondence Curriculum [0]. These are designed for self study and give a fresh perspective on topics they cover.

[0] https://www.goodreads.com/series/318605-gelfand-corresponden...

Check out Kahn Academy, they have a gamified course to guide you through the equivalent of a high school and early college math curriculum. AFAIK it's free?

The aops books [0] will take you from prealgebra all the way to calculus and discrete math and will give you a foundation strong enough to enter any undergraduate math program in the world.

And the books all have complete solutions manuals available so you can get immediate feedback.

You could use programs like Anki to schedule your review of defintions you've understood and problems you've solved to supercharge your learning as well.

[0] https://artofproblemsolving.com/store

For this partcular purpose, look no further thank Khan Academy.

I recommended a lot of people these courses and myself went over a few videos to revise Trigonometry.

I can vouch for the quality.

I found this to be a good explanation of Calculus in particular: http://lightandmatter.com/fund/

It assumes you have some algebra, but does not require college algebra.

I absolutely adore the works of John Bird: https://www.google.com/search?tbo=p&tbm=bks&q=inauthor:%22Jo...

it really takes you from the ground up all the way to advanced subjects. He published multiple books on various levels of mathematics.

I love this book: https://www.goodreads.com/book/show/17406856

The explanations are great and the examples and excises are such that you can just do them in your head.

try khan academy first?