A little advice from my cousin’s sister

(1)How are you? It’s been a while.
(2)Yeah, he’s doing great in college.
(3)I got an average of 95 this time.
(4)Oh great, congratulations
(5)My brother also scored over 4 this time lol.

(1)Cousin what…? Four points?
(2)You’re gonna get in trouble. Study hard.
(3)You’re a 4.5!
(4)4.5 out of 5!
(5)I’m a 4.5 out of 5.
(6)??? big brother (4.0/4.5)*100=88.89k
(7)Study hard
(8)아…?