Changing into engineering majors at UCSD appears to be competitive due to the majors hitting their enrollment capacities, but it is not stated on the web site how competitive each major is. http://jacobsschool.ucsd.edu/academic/academic_undergrad/my_major.shtml
CMC’s 3+2 program requires admission to a “2” school. For Harvey Mudd as the “2” school, your GPA must be 9.50 or higher (A = 12, B = 9, C = 6, D = 3, with +/- adding/subtracting 1 point). For other “2” schools, admission requirements vary based on the school. Note that this means 5 instead of 4 total years, and the “2” school’s financial aid will be subject to its own financial aid policies, not CMC’s.
Do you have any other affordable choices where you are directly admitted to your desired engineering major, or where changing into your desired engineering major is not difficult?