There are no admission guarantees for UCLA or any of the UC’s. UC’s are very GPA focused, but having a high SAT/ACT will you make you more competitive. EC’s and essays will also contribute to your chances and many times these can overcome a less than stellar GPA or test scores but is all about the whole package (holistic review). Here are the averages for last year’s in-coming Freshman class, but remember that these are averages and the more competitive the major, the more competitive the GPA/Test scores are needed.
https://www.admission.ucla.edu/prospect/Adm_fr/Frosh_Prof15.htm
Also check out the decision thread for this year to get a idea of what type (s) of applicants are admitted.