Disappointed with a 580 on GMAT : Need to get 700+ in 65 day

Hi Friends, I gave my first GMAT yesterday and scored a very sad 580 (Q39, V31) after 4 months of prep! This is worse than most of my mocks and yes its very disheartening. But I have some time before i send out my application for PhD in Marketing and I need to get a 700+ this time around. Sharing my...