I'll agree with you on the FOI but I'd bet you could pass the IFR

You sure? I'm not.

Do you remember how to do the wingtip bearing problems? You can't just
solve them exactly as trig problems - that gives you the wrong answer.
You need to use the official, approved approximation.

How about those HSI/RMI problems where you have to remember which way
to turn the knob to fix the slaving error? Remember - it's not like
real life where if it goes the wrong way you can just turn it the other
way.

What instrument is secondary when rolling into a standard rate turn?
For that matter, what instrument is primary?

How many satellites in the GPS constellation? How many miles is the
MLS azimuth information good for? What is the effective radius of an
H-class VORTAC at 16,000 ft?

What about those flight planning problems? The choices for some of the
answers differ by less than 2%, and you better remember how the FAA
wants you to interpolate winds. Hint - the correct method (vector
addition) gets you closer to a wrong answer than to the right one.

Do you remember what all the symbols on all the oddball weather charts
mean? I don't. The only RADAR chart I ever use anymore is the NEXRAD
graphic. For that matter, do you remember the oddball abbreviations in
TAF's and METAR's? Not just the easy stuff, like ceilings and
altitudes, but stuff like A02, SLP, and RAE 54? I know there are some
I forgot.

Too much of the test is useless crap. I've gone through that material
three times - once for my IFR, once for my CFII, and once for my ATP.
I had to memorize a lot of stuff each time, because it was totally
useless and I simply forgot. Maybe I would pass - but it would be a
skin-of-my-teeth pass. And maybe I wouldn't.

Michael