Highschool GPA: How can I raise my GPA?

I’m a Californian HS student. I have a cummulatice GPA of 3.78 my freshmen year and I’d like to raise it to a 4.0 by the end of my sophomore year. Im taking an AP class this year so is it possible to raise my GPA to a 4.0 by the end of the year? And do colleges a mostly look at Weighed or unweighted?