FICO Certification - Summary notes on Controlling and EC-PCA

Good day to all SAP FICO Gurus

I am preparing for certification test and attended the training. Things started jumbling in Controlling module. It's really difficult to memorise the flow for CCA, CEL, IO.

Could someone help in providing the summary notes on controlling topics from certification point of view. I would also appreciate if some sample certification questions could be provided.