Note that UCs generally appear to be GPA-heavy and test-score-light (although being top-end in both is certainly better). This season, it seems that many of the disappointed applicants to UCs were those who were test-score-heavy and GPA-light who mistakenly assumed that their better test scores would compensate for their lower GPAs.
Of course, the holistic reading of applications including subjective evaluation of essays and such means that high GPA and test scores are no guarantee of admission. Also be aware that admission thresholds could vary based on the division or major you apply to (e.g. engineering and CS majors are probably more competitive than most at UCLA).