Some of my import rows were rejected — do I start over?

No. The import runs row by row: the ones that passed are already in, and the ones with a problem come back each with its own reason. Fix only those rows and upload again — students already imported are not duplicated, because the same student is recognized from their name and number.

The most common reasons for rejection: a mobile number that is not a valid Indonesian number, a class name that does not match any class in the school, or an empty required column. The CSV template from the import screen prevents the first two, because the column names already match.