1 thing I noticed, i found derivatives easy to grasp and understand in both level 1 and 2. I solved the CFAI EOC problems with no difficulties, and i did get the concept in both levels; however, when it comes to the real exam, i failed it in level 1 and 2.
Easiest = FRA, Quants, Fixed Income, Economics
Fair = Portfolio, Ethics, Portfolio, Equity
Hard= Alternative Inv and Derivatives..
Again, I come from an accounting background so I always ace FRA (level 1 and 2) although most people sitting for cfa exam hate it.