What are the resources, books or papers you would recommend that would help me 'wow' Computer Science undergraduate admissions when I apply next year?
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I would certainly highly recommend looking at the schools you are applying to and making sure you meet the entrance requirements for the math courses. Look at the CS Math courses and see where you stand with the math they require (where are your deficiencies).
Additionally, I would look to some of the schools that specialize in CS and see what they require for students at either the undergraduate or graduate level (depending on which you are). You can see a detailed list of those schools US News' - World's Best Universities for CS.
In general terms, you might want to review:
You might also want to look for online notes, for example:
$\bullet$ Mathematics for Computer Science