I'm writing in June 2016
Dear believe yourself.
I have passed them a year ago, you just need to focus on the text book and the past papers, then read some technical articles to get more understanding.
It will be quite easy to pass them both since they are different type, one focus on statements, the other focus on regulations.
Keep practice is the only key to pass
The F7 paper entails some calculation and essay writing.It is a step forward in regards to F3.While F8 is more of essay writing.What you can do is understand the concepts in Audit and work on past papers.It is like doing F6 and F4.If you understand the basics from F3 i believe F7 will be okay.