Friends Kailan from Beijing and Karen from New York just had an interesting chat about their classroom settings and school scheduling, after which Karen talked with her mom about how similar and different her school and Kailan's school are. Which of the following is least likely a statement from Karen to her mom?

a
Kailan's school starts class around 6:30 a.m., which is about one hour earlier than when my school starts.
b
Kailan and her classmates have long lunch breaks so they can take naps. I have a very short lunch break for up to 30 minutes.
c
Kailan told me there are three years in high schools over there. High schools here have four years.
d
Before graduation, Kailan needs to take a college entrance exam called Gaokao. It's similar to our SAT, except Gaokao is held only once a year.