A college is considered to be "U.S.-style" if courses are offered in similar terms to U.S. colleges (i.e. quarters, semesters, etc.), you will receive a grade for each course in each term, and you will also receive an English-language transcript. If your school is not U.S.-style, as defined above, you must apply as a first-year student, by the appropriate Early Decision or Regular Decision deadline.
Are my chances for admission greater if I apply Early Decision?
Although a larger percentage of the Early Decision applicant pool is admitted than of the Regular Decision pool, that higher acceptance rate reflects the remarkable strength of a self-selected group of applicants. A candidate to whom we otherwise would not offer admission is not going to be accepted simply because he or she applied under the Early Decision program.
We strongly urge you to apply under the Early Decision program if and only if Columbia is your first choice.