4 majors seem impressive, but not. What's your research experience or work experience? I am in one of programs you mentioned, and many of my classmates have descent work or research experience. (at least 1~3+ years. Some already have PhD or MS degree before joining this program) you are OK with Math (not excellent), but NOT OK with Stat and CS. You can apply as many program as you want, but I would say you have chance below Columbia (IEOR) if you have good LORs. Go to Quantnet.com and check out tracker.