Well, I found these sites from a friend and thought that it might useful for those who want to learn Japanese.
http://www.ajalt.org/english/online/ ; eventually it'll probably open another window or something.
http://www.coscom.co.jp/learnjapanese801/index.html ; I'm not sure if this still works, since I haven't try it yet.
https://www.erin.ne.jp/en/ ; this one actually have videos, conversations, manga, and quizzing for you to be tested.
Anyways, that all I thought was useful. It may not be enough, but I guess it's alright to learn something rather than nothing.
Thank you!!
uhm...do I need to pay? (like other japanese websites)
Oh no, they're free, unless you really wanted the book.