Help with computer science “match” schools?

My son graduated on time from UC Berkeley with a double major math/CS, and only took 14-16 credits a semester. He started in multivariable calculus, so skipped a year of college calculus. He could have graduated after 3 years if he didn’t add CS as a second major in his senior year. We are both confused why some can’t graduate from a public U in 4 years, especially with one major. Did he just get lucky getting into classes? Or organize his schedule well? Maybe if he completely changed majors he couldn’t have done it, but very curious.

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