Fintastic - god luck in Feb. The 11th is a lucky day - had my assessment and sim on the 11th and somehow got through! Honestly, the assessment hasn't (well, hadn't in September) fundementally changed since Loc made his excellent first post. Think about your experiences and how they might relate to the sorts of questions they are likely to ask, rather than specific answers to specific questions. A bit of background gen on the company helps too.
Good luck!