Welcome to Kira Kira Haru! On the sidebar, there is "タグ". Start from Lesson E1--01.
Lesson E1 is Elementary 1,
Lesson E2 is Elementary 2,
Lesson i1 is Intermediate 1,
Lesson i2 is Intermediate 2,
Lesson a1 is Advanced 1,
Lesson n3 is N3 Preparatory Class.
I stopped going for classes before I finished the N3 Preparatory classes, I also stopped halfway through Advanced 1 classes. >.<" I'm not the best example of a good student (though I always scored 90+% in my school's tests) but because my interest in Japanese language is tremendous, I managed to pass JLPT N3 (Dec 2011) with 87.8% and JLPT N2 (Dec 2014) with 85.6% (and 100% in Listening). Not boasting, I just want to tell you that you can do it too!