Hacker News Reader

Khan Academy is good. Also http://patrickjmt.com/

I'm reading this one math book by Richard Hamming: https://www.amazon.com/Methods-Mathematics-Calculus-Probabil...

Not sure if that's what you're looking for, but it seems to have all the stuff I forgot from college.

Disclaimer: I am the author of this Top-down learning path. Could you please take a look and give me some advice? Or If you have any opportunities, please drop me a line.

My advice would be to figure out what you want to do more concretely. Machine Learning / Data Science is a big field, if you have more concrete goal I think it would be easier.

And yet you're here, looking for math refreshers :)

I personally don't do a lot of feature engineering and I do regularly read papers, I just don't think that I am typical.