Dialog bahasa inggris surprise

aDinda did you know something
bNo? What it is about?
a    About your mathemathic score !
b     About my exam score?
a    I heard you get 100 on mathemathic
b    WOW really? I dont believe it !! Are you serious??
a    Yes of course
b   I dont believe it, mathemathic is difficult major for me
a   But.. the fact you got 100
b   Okay thank you.