When you arrive in Dartmouth for the semester, you will have the opportunity to attend academic advising sessions, consult course catalogs and discuss your options with academic advisors. Graduate students will do this in their departments; undergraduate students will do this in special group sessions or in the Academic Advising Center.
As international students, you are expected to maintain full-time enrollment. For undergraduates, this means a minimum of 12 credits a semester. Graduate students must carry nine credits for additional information see the Graduate admissions site.
There are a few exceptions for international students to reduce their course load. This must be discussed with the International Student and Scholar Center before the student has withdrawn from a class.
Like other students you may take any course the university offers as long as you have the necessary background and there is sufficient space in the class (most classes have a maximum number of students). You must take certain courses to fulfill departmental/graduation requirements.
The International Student & Scholar Center cannot help you select courses or even explain academic requirements except in the most general terms. You will have an academic advisor who can help you with these matters. When you arrive at the university, you will be told how and where to seek academic advising.