Post 3kyu grammar book

[cosmicferret]

Hi

I've just taken the 3 kyu JLPT test and i'm hoping to keep the momentum going with my studies. I was using Japanese for Busy People 2 and the Intermediate JET programme language course. I've flicked through Japanese for Busy People 3 and it looks like it mostly covers stuff I did for the test so can anyone recommend a book which will give me more grammar to study? If I can keep things rolling along I might even be able to take a stab at 2 kyu next year.

Thanks