I'm in the same boat, though I had 6 years flying the 190 a decade ago. I want to get myself well ahead of the power curve, show up for training and feel like it's more of a refresher. Plus I need to hard erase the Airbus info that is still stuck in my head from the last 10 years flying it.

I've found Quizlet does have several sets of E175 study cards, some are marked as Envoy, though they are user created, so while I'm going through them, I'm not memorizing everything in case there are bad numbers in there.