For students who did not apply for a high-demand major at the time of application, there is no advantage to applying early for a comprehensive review.
First-year students applying to the College of Letters & Science with an interest in a high-demand major are highly encouraged to select that major on their UC Berkeley admissions application. If admitted to L&S, they will be guaranteed a spot in the major they selected, subject to completing prerequisites, maintaining good academic standing in L&S, and filing a declaration form.