Useful resources to improve your Math skills -
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Khan Academy is the best online free resource to learn Math for Data Science. (https://lnkd.in/eWZFANt). 
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Krista King has also done a great job in creating exceptionally good introductory course. She is too good in designing the course. (https://lnkd.in/eyMecjA). 
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3Blue1Brown (https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw/playlists). 
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The Elements of Statistical Learning(Springer Series). 
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Introduction to Linear Algebra by Gilbert Strang. 
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Naked Statistics by Charles Wheelan. 
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An Introduction to Statistical Learning: with Applications in R. 
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Pattern Recognition and Machine Learning by Christopher M. Bishop. 
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Pattern Classification ((A Wiley-Interscience publication).