Go and take Chris Lightfoot’s Estimation Quiz and learn how good you are at making wild guesses estimations.
I got 37% (and 56% on a second attempt aided by having briefly seen the correct answers and hindered by a night in the pub).
I wasn’t helped by the fact that both times I confidently said that the Act of Union between Scotland and England was exactly 1701, which was a stupid conflation of the correct answer and 1801 (the date of that other Act of Union).