it just means that the students are in the top 15% GPA at your high school. See below:
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Students in the top 15 percent of their rising senior class receive a letter from UC in September, congratulating them on their academic achievement and encouraging them to apply to UC.
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ELC is top 9% in their high school based on UC benchmarked GPA. ELC status is determined when the UC application is submitted. All UC applicants from participating schools will automatically be screened for ELC
