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Your math training is the greater problem. It's good that you've done well in the math courses you've taken. However, the math you've taken and the math you'll be required to understand in graduate school is entirely different: application-based versus proof-based. If you want to practice your proof-reading and writing skills, and also send a strong signal to adcoms, you ought to consider taking a course in real analysis. If there's an honors version (i.e. more theoretical version) of the linear algebra course, be sure to take that as well.