Below is the Freshman profile for 2014. Until you have SAT/ACT scores, it is difficult to give you an idea of your chances. Your GPA looks on target, but you may want to address your Junior GPA (if it continues to decline) in one of the UC essays next year when you apply. Keep up your EC’s and look for a leadership position to help boost your application. At the end of your Junior year, calculate your UC GPA: http://rogerhub.com/gpa-calculator-uc/ and see how you compare.
Good Luck.
http://admissions.ucsc.edu/apply/counselors/high-school-counselors/freshman-student-profile.html