2019 September 2 now i'm very happy because i can get a graduation certificate. i get this certificate is so difficult, why it's verry difficult? because my manager, he had many job in company. he could not teach us so we taught ourselves. i think that very difficult because it used japanese language. if you got certificate of work internship in Japan maybe you can use in your country for find a job and your visa can be extended and you can stay in Japan for 3 years. and if you don't pass the written test and practice exam then you'll return to your coutry, you can only stay in Japan for only one year or unless you are married in Japan you can live in Japan as long as you want.