Find out whether this student – who withdrew from college after three weeks – should apply to another school as a transfer. https://insights.collegeconfidential.com/does-three-weeks-make-transfer
UCs in California consider a student who has enrolled in college after the summer immediately after high school graduation to be a transfer applicant.
https://admission.universityofcalifornia.edu/counselors/transfer/
So (as the article mentions) it is important to check the rules of each college that is under consideration. (Actually, the student in question should have done this before withdrawing from the current college.)