@Soccerninja So 1A and 2A just means “première année” and “deuxième année” or first year and second year. Within the Dual BA program, your first two years (1A and 2A) follow the same structure as every other Sciences Po student (ie you won’t have separate course requirements or take courses separately from non Columbia Dual BA students).
Your first year (1A) is made up of fundamentals (introductory classes like political science, history, sociology, etc.), language courses, and electives. Your second year (2A) will be similar to 1A, except in addition to fundamentals, language courses, and electives you will also take courses specific to your major. At each campus, the courses will relate to the region of focus: for example, 19th century history of Europe and Asia at the Euro-Asian Program in Le Havre.
You can find more information on the academics at Sciences Po here: https://sciencespo.gs.columbia.edu/sciences-po-academics