It depends on whether the study agent you are looking for is awesome! Some intermediary students go to Japan to be black! Then it is very bad for management to recognize these intermediaries. Will resent the next batch of people who follow the intermediary!
There is also a lucky draw, depending on luck. The Admission Management Committee will call your home or the guarantor's company some time before issuing the visa to verify whether your materials are correct. I almost called to ask for some Japanese, and I almost went to the embassy for an interview to take a Japanese test or something. This is something that very few people will draw.
There are other factors, less important, depending on luck. There are too many reasons for refusing a visa. I heard that another person refused the visa because the photo looked like a terrorist. Ha ha.
Good luck.