Ooph. I’m sorry: it looks like you have been let down in several dimensions.
First step is a serious talk with your parents about $$- seriously is GW “good enough” that they will pay $77K / year for it? Is UMi “worth” $67K/ year? do that for each school before you write you LOCI! Or…by “support” do they mean co-sign loans? b/c GW is a great school, but it is not worth $300K of debt.