While seniors may be judging the merits of working in Boston's financial district or New York's Wall Street, members of the Class of 1990 are probably just beginning to think about something a little less traumatic. Like what to major in. Though the decision is still six months away, freshmen will be making choices between Classics and Chemistry, Soviet Studies and Sociology.

To offer 'shmen that competitive edge, here's a crystal ball look at some vital statistics about Harvard's academic departments compiled from a 1985 survey:

.Departments which sent the most concentrators into public service: Social Studies (6 out of 69); Comparative Study of Religion (2 of 11); and Government (5 of 116).

.Departments which sent most concentrators to law school: Government (18 of 116); History and Lit (8 of 80); and History (8 of 110).

.Departments which sent most concentrators to medical school: Biochemistry (40 of 82); Biology (56 of 110); and Chemistry (5 of 20).

.Departments which experienced the greatest exodus of concentrators between 1981 and 1985: Applied Math (-40); Engineering (-56); Biochem (-60); and Economics (-85).

.Departments which experienced no change in the number of students in the same period of time: History (412).

.Departments which experienced the biggest increases in concentrators between 1981 and 1985: English and American Literature (47); Anthropology (65); Computer Science (105).

.Number of students in Computer Science in 1981: 0. Source: Results from a survey of 1985 graduates in the Fields of Concentration, 1986-1987.