Amusement Parks and Garbage

Written by: Farid Ahmad Joya

Maryam and Najib were siblings lived in a green village near the city. Both were school students.
It was exam day. Maryam suggested Najib study school lessons with her so that they would not face problems in the exam. Najib accepted but made a condition.
What was Najib's condition and did Maryam accept it or not?