One key problem was that my initial training was not acronym-heavy. Why, i don't know. But this guy loves acronyms, and I'll give him credit: they're useful mnemonic tools. It's all fine and good to say you know this or that list, but it's hard to begin describing it sometimes.
He got me good with a few of those, and a few very arcane tidbits... stuff I've forgotten as I couldn't see any practical use for that knowledge, I guess.
Here's a sample acronym:
What does "T.O.M.A.T.O. F.L.A.M.E.S." stand for?
And here's a sample airspace question:
What class is airspace above FL600? (that's right, 60,000 feet).
He also got me on some very Day-One stuff, like what marking on a VFR chart indicates fuel and services available at an uncontrolled airport. Anybody remember without looking? When more active, I always checked the AFD first, on those rare occasions when i knew I'd have to refuel. But his point was valid: what if? What if you needed fuel or repairs, and didn't have an AFD, or hadn't checked first?
Anyway, we're doing another ground session tomorrow... he warned me that he's a real stickler for weather knowledge. Great...

Also have to bone up on my C172 system and performance stuff, but that is still pretty fresh in my mind. so I'm not too worried.
I'm a little disappointed that I didn't get to fly, but the weather is just ghastly right now anyway... even if we don't go up 'till next weekend, that might be best.
And I don't mind being grilled like this; it's always good for pilots to have their knowledge challenged. It's amazing how dusty and disorganized those mental files have gotten since I (very handily) passed my written and oral exams several years ago!