Improve your scores and really consider lesser known and lower selectivity schools where your math 650 will not make you very unattractive. You should also not be in the bottom 25% of your school
Did you take AP Calc ? Where are you in your math sequence ? Enrolling at a challenging engineering school without sufficient math preparation will also get you into trouble, and there is no need to take pre-calc at a 4 year school if money is an issue. A summer course may also help get you ready for freshman year.