The fear of being caught by parents or "ustazah" (religious teachers) adds a layer of suspense. This often leads to "rahsia" (secret) meetings behind the school labs or at the nearby mall after school hours.
They attend the same tuition center outside of school hours. Since they aren't under the watchful eyes of teachers or school prefects, they feel more comfortable talking. They bond over their shared hatred for Add-Maths and exchange notes that have "secret" messages written in the margins. The Climax: