The scores of specialized courses in domestic universities have no influence on the entrance examination of Japanese universities. If you want to take an English test, it depends on your major. Even if you want to take the exam, it won't be difficult, just translate a simple English article into Japanese.

If the university is good, there will be advantages, because if the university is good, the professor will think that you are an excellent student, and if the professor wants you, you will be more than half successful. Even if you fail, you can be a "graduate student" in the teacher's research room for one year.

In fact, the most important thing is the level of Japanese. It is much easier to go to college in Japan than to go to college. If your Japanese level is above level 2 and you want to find a school to contact teachers with your heart, you can basically be admitted to a junior college. Of course, the better your Japanese is, the more likely you are to be admitted to a good university.