L1. Not too difficult, really. L2. Tough. Lots of stuff, difficult exam and not everything is interesting. L3. Tricky. Interesting stuff that makes you think you know the material. And you DO, you just screw up at the exam before you know it. It gave me a false sense of comfort with one month to go, I woke up when I did my first practice exam. Hopefully I was awake enough to pass the test. We’ll see.
L3 is difficult simply because 1. Some portions of the curriculum are vague (both their statements and definitions) 2. The curriculum is not integrated in a systematic and/or consistent way so that many candidates are confused and spent much time to clarify the confusions. 3. Very much material to memorize rather than understanding.