I have just found a site where I could train my English, for a start I decided on the GED (a kind of "supletivo"), so the questions require high-school knowledge (and, at the same time, it´s not that hard).
I scored 50 percent. My excuse is, I did it real fast, just to get acquainted to it.
So, I did like it, at least I could read and understand it well (that is, I could know why, how and where I made mistakes, eh?
I share info here to others students, be well and good luck.
I must say, it is well designed and user-friendly. Very good indeed.
http://www.4tests.com/exams/questions.a ... 38&qtrck=1