Chances of getting into UCSB, junior in highschool!

Hi, the title says all. I really want to get into UC santa barbara and major in Computer science. It is my number 1 dream school.

What are my chances? My SAT score is 1870, but i plan to raise it to 2000 very soon.

My cumulative gpa as of right now ( second semester of junior year 1st quarter) unweighted : 3.19 and weighted 3.42.
For my sophomore year, i got 3.833 unweighted first semester, 3.333 unweighted second semester.
and junior year… 2.166 unweighted first semester (taking 3 AP and 1 Honor class, was too difficult for me to handle).
I got 1 D in my AP calculus class and that is the only D I got in highschool.

Do I have any chances? My Sophomore / Junior year GPA is 3.11

I don’t have any extra curriculum yet. I am planning to do community service junior year summer/ first semester of senior year. I don’t have time as of right now.

Please help!! thanks all

+PS I am taking AP calculus, APUSH, and AP psychology with Physiology Honors.

Average UC GPA 4.02 and average SAT score 1925. For CS/Engineering majors you need to be above the average Stats, so you need to work harder to have any chance. Are you repeating the AP Calc class because you cannot have anything lower than a C in an a-g course requirement or you are not eligible?

http://admission.universityofcalifornia.edu/counselors/files/csu-uc-a-g-comparison-matrix.pdf