Suggested courses to take to apply for PhD in Stats/Data Science

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Hello!

I'm currently a rising sophomore with a tentative goal to do graduate studies in Statistics or Data Science. I was wondering what pure/applied math or stats upper division courses you would recommend that would give me a firm foundation? 

Here is the math course browser: https://www.ucsd.edu/catalog/courses/MATH.html 

I was thinking about taking one of the Algebra classes with Intro to Numerical Analysis, but I am not sure. 

Thanks in advance!