I found other English learning site by free of charge.
IELTS International English Language testing system（IELTS：アイエルツ)
They say that moer than 2.9milion people took this test in 2016. 
They provide some of test on site, so I took one of them. 

This is about what I thought after took this test.
1.  vocabulary   
     the area I know is limitted. and In order to get good score 
     for this kind of test, I need to learn (memorise) variety of words/vocabulary  
     from many kind of area.  I must do, and I want to , but in realistic view, 
     it would not be easy. almost impossible. 
     what I realize is that it would be better to focus some specific area which 
     I am interested in. 
2. purpose
    the purpose I lean English is for Job I would like to work and travel abroad.
    It would be efficient to learn words/vocabulary from the area relating to them. 
3.  long way
    One of my target to learn English is to get the score over 850 at TOEIC.
    and to make my dream come true, learning many kind of vocabulary from  
    variety area will be MUST.  so, I have to keep learing words from many area.
    this is not consistent with above 1.  I know it, but that is why I am struggling.