My friend gave a pre-test CDL exam test. It had 90 questions on it and i missed 32. This being said I have never studied for this, never read a book on this stuff. I think that once i start studying and actually start taking classes. I wont have no problem passing the written exam. Alot of the questions i missed were questions that i had no idea what is was talking about.
The test is pretty easy mostly common sense. Like my instructor told me it is what it is don't read anything into it