直接go to university in Japan就行了
If i want to go to university in Japan, I have to pass JLPTgrade one, and also need the IELTS Results.If I want to be postgraduate in Japan has to pass JLPT grade one, IELTS results are also needed.这么说可以么不可以，你后面不可以连起来啊，这是条件状语从句，if i want to be a postgraduate in Japan,这是达到条件下的结果，条件是I have to pass JLPT grade one, IELTS Results are also needed. 后面的条件可以分开写没问题，然后你要注意是I have to pass 而不是用has，i 是第一人称。