Yes, 1 semester= 1/2 year course
2 semesters= 1 year course
So for the UC’s there is a minimum 15 year long or 30 semester courses just need to be considered and completed by end of Senior year. As I stated above, only a small percentage of applicants will have just the minimum and since UCLA is one of the top UC’s, they will expect to see a-g courses above and beyond the stated minimum. At this point, you do not meet the minimum for the history requirement, so as @10s4life posted, you need to take an SAT subject test either US History or World History to help strengthen your application.