Urgent guidance required!

Hello, I have approx 20 days before my IPCC Group-2 accounts paper. This is my 3rd attempt and everytime due to lack of time and improper preparations I do not succeed in clearing. Kindly suggest certain things that should given preference time allocation per subject and useful tips and topic to be given priority in this exam. And also looking at the time I have in hand will exclusively following the practise manual be okay? Or are there any reference books which should also be seen.? If yes then for which subject and to what extent.? Kindly reply ASAP Thank You 20/10/2012