Recommended math resources to fill in knowledge gaps?

I’m starting to get into more advanced data science concepts, and want to ensure I’ve covered any potential knowledge gaps I may or may not know about relating to the fundamentals.

I’ve had a look at the FAQ and I do utilise Khan Academy already. I’m looking for more book based recommendations to supplement video/tutorial style learning.

Previous learning: I do hold a couple of degrees in geology. In undergrad I did do fundamental math, statistics for natural sciences (introduction), …

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