pad / ream (of paper) / set, collection, section / volume (of a book series) / episode (of a TV series) / booklet / prequel or sequel

to practice, to drill, to learn, to do exercise, to exercise oneself, to cultivate, to accustom oneself to

to gather (people) / to gather

(set theory) a set (collection of mathematical objects, often having a common property)

(computing) file

a traditional custom

to practice

to study; to learn

to gather (at a particular location) / to concentrate; to focus

to take an internship, apprenticeship or on-the-job training; of teachers-to-be in particular, to actually conduct a class as a teacher, as opposed to kiến tập