At UCB and UCM, the campuses are on a semester schedule, and I recall full-time at UCB was 13 units for most colleges (College of Engin is 12 units). College of Letters and Science (often referred to as “LnS”) hosts most majors, so you’re likely going to enroll in 13 units minimum. This is 4 courses over the course of 15 weeks. Courses are generally 3-4 units each, with smaller seminars 2-3 units. Not sure about UCM, as the campus is quite new.

The coursework will be more challenging than high school AP courses. Keep a balanced schedule and enroll in the minimum units the first semester and see how you feel. If this is comfortable, keep the same unit value each term and take summer sessions of you want to stay on the ‘four year’ plan. If you feel the coursework was managable and can add more, add one more classin a future term. Go back to the minimum again when you begin your major/upper division coursework, which will intensify in difficulty (at least imho).