Five levels, the lowest level and the highest level. You usually need this certificate, which is an exam to prove your Japanese ability. (commonly known as business Japanese test), the highest level is J 1+, followed by Ji, Ji, Ji, Ji, Ji and Ji. A * * * level 6. Among them, those with J 1 or above can participate in the oral interview OPI (Oral Performance Test) * * * which is divided into four levels: elementary, intermediate, advanced and super. Through role-playing, impromptu interviews and other forms to measure oral English. There is no examination room in Japan for studying abroad, but there are examination rooms in some overseas countries. It is a common test for international students to enter universities. There is no equal rank. Apply for a suitable school according to the results, which is similar to the national unified college entrance examination results, with a full score of 400. The function of each certificate is different. The Japanese proficiency test is about general ability. Business Japanese depends on whether etiquette can be used accurately in different business situations, whether it has the ability to cope, and how to use Japanese. Because there are respectful words and self-deprecating words in Japanese, the application of this aspect is directly related to the company's image and direct interests. OPI is an oral test, which tests whether a topic can be carried out smoothly and whether candidates can freely apply and change roles between different scenes and different speakers.