You need to contact each school to find out their change of major policy as a new student. Since Engineering is highly competitive at the schools, most likely you would have to enroll as a student, take some pre-req courses before actually declaring a new major. Check the school’s website to see if the change of major policies are listed. Changing between Business and Engineering could be problematic and you may not be able to do the change at all for some of the schools. Definitely find out now before committing.