EXTRA TUITION

Ei! Who is giving last minute tuition to the girls who are waiting to sit for their Additional Mathematics Paper for the SPM Trial Examination in the school hall this morning?
Can only see her back. I must go closer to see who it is.
Ah ha! It's Puan Rasilah.
Puan Rasilah: See girls, this is how you solve this problem.
Pn Rasilah (looking up): Oh! Li Na. It's you.
Miss Cheah: Heh! Heh! Who else but me? Hu! Hu! Hu!