Just took mine... remember, it's not really a test. Not a pass/fail test, anyway. It's a review. The instructor should not try to block you, so much as assess you. For me, it was sort of a test, because it was combined with a rental checkout at an FBO new to me, but that didn't make too much difference.
But one shouldn't try to breeze through it- it's an opportunity to sharpen up your knowledge and skills. And if your CFI is good, you'll be challenged a bit. Relax, though- that's good for you.
As far as the "test" material goes, I ditto the others: very heavy on the Part 91 stuff... and I'd suggest perusing some charts of unfamiliar areas; my BFR CFI pulled out an LA TCA to go over chart interpretation, and I was like: "wwhaaaa?"

And don't forget the "I'll-never-need-that" stuff like light-gun signals... I answered my first light-gun question accurately, so he moved on. I was hoping he'd ask me about flashing white in the air (remember that one?)...

And yes, near the end of the ground session, things devolved into hangar talk, and our flights together (I went up twice; very rusty, and pretty windy the first day) were full of friendly banter. I never got the impression that the CFI was not respecting the hours I'd accumulated.