I'm also sitting it soon. I'm focussing on past questions from both ATPL online and aviationexam, and then reading up on the weak areas. I appreciate a lot of people see this as "cheating" but it's the most efficient way to revise. The tough areas for me are electrics and hydraulics, so I'm spending most time on those.
It's a big subject so definitely justifies some long hours spent revising. I was considering taking AGK, Instruments and radio-nav in Jan but am probably going to just do AGK and intsruments, and do radio-nav on its own in Feb as that seems a tricky one.
The run up to Christmas is not the most productive time of year for studying!