Just study through BPP believe me . Study F9 as you are a financial manager . Try to do all practice question within chapter go through with every example . After completing go through the latest 4 years past papers . :)
You could certainly pass any ACCA exam with self study although tuition is really helpful for papers like F9 and P2.
There are a lot of available online resources which can help you a lot.
After discussing it with some colleagues I have been suggested below resources for preparation:
Your hard work for F9 could be really helpful for you in P4 exam as well.