3 Questions About Education after College

Hello,

As a math/econ double at a non-target, I have some questions about education after graduation.

Prevalence of Economics PhD candidates in investment banking? - I am hoping to break into investment banking but also have interest in an economics PhD program. Do I realistically have time to do both in the couple years after graduation?
GRE vs GMAT? - I thought GMAT for investment banking, but I heard GRE for PhD.
Best Ways to get into quant trading? - I would love some insight into how some got into this industry from potentially a similar academic or school background.

Any insight would be greatly appreciated.
D

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