Also, a nice addition made between Java 11 and Java 17 is the 'B' symbol, meaning "period-of-day", such as "in the morning". Might be something that gets asked on the exam.
Radu,
Congrats on finding the second error in the book. I've given you a cow and added it to the errata. This was definitely a typo. We even correctly use lowercase "s" in the example immediately after that table.
I don't think you'll see "B" on the exam. They only cover the most common ones. I could see "B" being useful when writing a real application though.