Hi, I am a Junior in High school and my current GPA is a 3.1 unweighted (3.5 UC GPA) and I am from California.
My top schools are:
UCSC
Santa Clara University
UC Irvine
Pepperdine University (Yes, I am a Christian)
UC San Diego
Other:
I code in HTML & CSS, and Swift (iOS apps) mainly
URM ( I am Colombian)
First generation
Taking 3 AP classes at the moment
What can I do to get my GPA up? (Besides doing good in my current classes and do good in senior year)
You state it in your last sentence. Students who excel and consistently get As sometimes have great study tricks and habits that are easy to adopt and can make a big difference in your academic achievement. See if your guid counselor or favorite teachers can lead you to some of these.
You can take online classes to help boost gpa
@FloridaBoy954 Ok, I will definitely do that then 
First check to see if your school will consider online classes and what the requirements are.
Many (probably most) high schools will not include online classes (or classes taken at other schools) in your GPA. Talk to your guidance counselor to find your school’s policy before you rush to take online classes. Unfortunately there is no substitute for hard work for getting good grades. Work towards having a strong finish to this year and a good start to your senior year.
Take hard classes, get A’s. That’s it. An upward trend can save you from having a low GPA.