Meghan, Duchess of Sussex, revealed as much on her recent"Archetypes" podcast.
As reported by theDaily Mail, Meghan said, “That citizenship exam is so hard.
I was studying for it [the test] and I remember going, ‘Oh my goodness.’

I would ask my husband, ‘Did you know this?
Did you know this?’
And he would say, ‘I had no idea.'”

The 24-question multiple choice test costs 50 and 75% is a passing score.
There are plenty of no-brainers (“When is Christmas Eve?
“, but she might be forgiven for not knowing precisely when the Vikings attacked Britain.
(AD 789, if you’re keeping score.)
Two sample questions on the test are: “What time do pubs usually open?”
and “How long does it take to give blood?”