I didn't pass the COMLEX 2 CE. I did the entire COMBANK. It is NOT representative of the real test. I did well on the COMBANK (over 70%). The only thing it helped with were the ethics questions. However, the COMBANK was too easy and the COMLEX is somewhere between the COMBANK and USMLEWORLD in terms of question style. The biggest flaw with the COMBANK is the OMM style questions. They are absolutely nothing like the real questions...not remotely close and I think the authors of the COMBANK are aware of that.
To be fair, it may still be worth getting because the ethics questions were very representative. And if you want an edge, I think the COMBANK will help. However, it shouldn't be viewed like USMLEWORLD because its not comprehensive and the style of questions are not representative. Use the COMBANK as an adjunct but don't use it like USMLEWORLD. That's what I did and I didn't do well.
The "tips" are kind of a joke. Nearly every "tip" was something along the lines of "Cardiology is highly tested on the COMLEX so know your Cardiology well" Well duh... Very rarely, was there a hint on something specific that wasn't common sense.