How can I enter a company or a crew to become a director?

If you are really admitted to the director department of Nortel, you can enter the circle, get in touch with people in the circle and accumulate contacts, but it is very difficult to enter those internationally renowned big companies after graduation. As you said, you should shoot more works and take part in more competitions during school. If the popularity does come up, those companies will be interested in you, take the initiative to find you, and you can enter.

There are several difficulties here: first, it is a bit unattainable to be admitted to the director department of Nortel. Second, it is more difficult to shoot more works to participate in the competition and gain popularity. Molded works must have investors, which is not easy to find. To really achieve the popularity that big international companies are interested in, you have to attend international film festivals and win prizes, and then you have to go through the examination of the General Administration, which is beyond your control.