I sat it a few years ago, but understand the format has since changed.
Professional exams are structured in a way that you can't afford to leave topics out when studying. Not what you want to hear I'm sure, but better that you face it now than in a re-sit.
I assume you can still bring the Companies Acts into the exam with you, in which case you should familiarise yourself well with these. Also, try to get your hands on some sample / past papers from the ICAI.
Best of luck in it.