A few I do regularly;
Odds calibration. Make predictions, with odds, about things. A number of people do this on a yearly basis (https://www.vox.com/future-perfect/2019/1/15/18182069/2019-predictions-forecast-democratic-nominee-brexit) but you can do it on a much shorter range as well, estimating how long a chore will take, which people will arrive to a dinner first, or how much a company's stock price will move after some announcement. "My next meeting today will not wind up canceled, 80% confidence." Write these down somewhere accessible (though probably private) and record the accuracy. The goal is for the things you say will happen with 80% confidence to happen eight times out of ten.
Be wrong. State aloud and write down some fact about the world that you think is true, think of an authority you would trust (Wikipedia is a decent starting point here) and then look it up. "The population of Houston Texas is between one and two million." If you are right, bask in the warm glow. If you are wrong, admit aloud that you are wrong, and what the right answer is. The goal is to get used to saying this when it is correct to say. (Speaking of which- I was wrong, the population of Houston is over two million.)
Follow curiosity. I'm not confident that "keep googling questions and clicking links in Wikipedia until you feel the confusion disappear" is especially efficient, but learning what "wait a minute, I'm still confused on how this actually works" feels like is easier to me when there's no pressure to nod and move along with the class. Notice the feeling of confusion, and what makes it disappear. (I'm curious what happened with Houston's growth spike from 1999 to 2000- Montpelier Vermont and Lincoln Nebraska show similar jumps that year, but not Albany New York or Orlando Florida- but it looks like my meeting was only delayed and not canceled, so I'll have to figure that out later.)