I did the free Lumosity.com exercises for a couple of weeks before I had my Compass interview.

I felt it helped on the cog portion. The actual exercises between the two are different (although a few are very similar, particularly the pattern matching ones) but it was more a matter of getting used to the concepts and dusting off the cobwebs.

I'm an old fart, so I need all the practice I can get.

For sure, I don't think hitting Lumosity, or something similar, for a bit would hurt at all.

And as has already been pointed out, just keep plugging away and don't get frustrated. It's a weird set of tests, but doable.