Follow the instructions in the application packet, which you should request from the department of your choice.
Many departments admit students only for the fall semester.
Information on departmental deadlines and requirements is contained in the application packet. Each graduate program at Berkeley has a maximum enrollment, which limits the number of applicants who may be accepted. Almost invariably, this maximum is smaller than the number of applicants who meet the minimum qualifications for admission. Selection procedures are designed to admit applicants in accordance with their relative merit and promise among those at least minimally qualified. It is to your advantage to inquire early about the possibility of study at Berkeley.