Like most CSUs, CPP uses and eligibility index to evaluate all applicants. Read about it here:
http://www.cpp.edu/~admissions/undergraduate/freshman/requirements-deadlines.shtml
Notice there’s no room in the formula for ECs, leadership, volunteer hours or anything.
A CSU GPA of 3.35 and an SAT of 1150/1600 give you an index of 3830 - that’s pretty good and will get you into most majors at CPP and most CSUs. Unfortunately, it probably won’t do the trick for Engineering at CPP.
A higher SAT is the only thing you can do at this point. 1250-1300 would make you a stronger candidate.
You should still apply because the applicant pool drives the threshold and you might make it in this year. Also apply for Chico, Fullerton, SJSU, Northridge and Sac