Did you study all the topics thoroughly, and in particular did you watch all of my free lectures (they are a complete free course for Paper FM and cover everything needed to be able to pass the exam well)? If you haven’t watched the lectures then I do suggest that you do watch them.
After completing the studying, just attempting a few past exam questions is not enough. You must buy a Revision Kit from one of the ACCA Approved Publishers, and attempt every question (without looking at the answer until after you have attempted the question).
If anything is not clear in the lectures or if anything in any of the answers in your Revision Kit is not clear, then ask in this forum and I will explain.