What are the requirements for marine engineering and recruitment of foreign companies?

I study sailing. If a sailor wants to be sent to a foreign ship, he must be fluent in English. As for professional knowledge, I feel that I can pass the exam and recite the question bank. The key is my future qualifications and experience on the ship. Before applying for a job, I'd better prepare my professional knowledge, such as collision avoidance, sailing and learning from others on the boat. I know nothing about it. Students, come on!