Lots of free time over the summer, how should I spend it?

I'm going into my last year of undergrad in the fall and am trying to improve my DS skills to get a better shot at landing a job when I graduate. I'm a CS major with an emphasis in DS and ML. I have a ton of experience coding in python, but relatively little experience doing real data analysis.

During this past semester, I applied to a bunch of places for DS/DA summer internships. I got a few interviews and …

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