Hi zzhangho,
Since you specifically named a JD/MBA program as your interest, have you taken the LSAT yet? If so, then what were your scores?
Academically, a 710/Q51 is an outstanding score, so you can apply to any School that you choose. JD/MBAs are rather specific programs though and Northwestern is a highly-ranked (and competitive) School, so you might want to discuss your situation with an Admissions Expert. There's a Forum full of them here:
ask-admission-consultants-124/GMAT assassins aren't born, they're made,
Rich