<p>After reviewing your stats I think you would have a much higher chance at getting into McCormick than Weinberg at this point. They would give preference to a student with some engineering background.
After you gain admittance into the university I would imagine you could transfer to Weinberg with relative ease. For more info I would suggest posting your query on the Northwestern forum. There are many students there that are already attending the university.
Also are you a premed student?</p>