Will Carington, works for Noodle
There are several requirements that all applicants must meet in order to be eligible for admission to UC Irvine; these requirements are listed on UC Irvine's undergraduate admissions page. They include a Subject Requirement (you must successfully complete UC-approved courses in the 'a-g' subject areas with a C grade or better), a Grade Point Requirement (you must earn a minimum GPA of 3.0, or 3.4 for non-California residents, in all 'a-g' courses), and an Examination Requirement (you must submit scores from the ACT Assessment plus Writing or the SAT Reasoning Test).
Meeting these requirements is an important first step in gaining admission to the university, but does not guarantee admission. UC Irvine's undergraduate admissions page provides a comprehensive overview of criteria used to evaluate freshman applicants. According to the admissions section of UC Irvine's Noodle profile, factors that the admissions office considers "Very Important" are your application essay, the rigor of your academic record, your GPA, and your test scores.
If you have any questions, don't hesitate reach out to your school counselor or contact the UC Admissions Office. You might also want to check out Noodle's college search tool, which allows you to enter your academic information (GPA, test scores, etc.) and personal preferences (school size, tuition, cost, location, etc.) in order to find schools that might be a good match for you.
Hope this helps, and good luck!