When a Young Adult takes an aptitude test prior to enrolling in University, there are several factors that are taken into effect for each of the majors. The more of these factors your Sim has the more credits that Sim will get towards that degree.
Business
Skills: Charisma, Social Networking, Mixology
Traits: Genius, Ambitious, Evil, Frugal, Workaholic, Born Salesman
Career Progress: Business, Criminal
Technology
Skills: Logic, Handiness, Inventing
Traits: Genius, Computer Whiz, Handy, No Sense of Humor, Good, Eccentric
Career Progress: Law Enforcement, Military
Science & Medicine
Skills: Fishing, Gardening, Science, Alchemy
Traits: Genius, Bookworm, Perfectionist, Socially Awkward, Green Thumb, Perceptive
Career Progress: Medical, Science
Fine Arts
Skills: Painting, Cooking, Guitar, Piano, Drums, Bass Guitar, Street Art, Sculpting, Nectar Making
Traits: Genius, Avant Garde, Artistic, Natural Cook, Virtuoso, Rebellious
Career Progress: Culinary, Music, Film
Communications
Skills: Writing, Photography
Traits: Genius, Charismatic, Irresistible, Schmoozer, Flirty, Social Butterfly
Career Progress: Journalism, Politics, Fortune Teller
Physical Education
Skills: Athletic, Martial Arts, Riding
Traits: Genius, Athletic, Loves the Outdoors
Career Progress: Professional Sports