A dialogue about the preparation for examination

A father is anxious about his son, Raju's examination is knocking at the door. Now, write a dialogue between Raju and his father.
A dialogue between a father and a son about the son's preparation for examination:

Father : Raju,-when will your examination begin?

Son : On Tuesday next.

Father : Have you prepared well, my boy?

Son : My preparation is quite ok in all subjects. But, I have problem in Mathematics.

Father : What's the problem, my son? Is it very difficult to you?

Son : No, father, not so difficult. But, I simply forget after a long time what I solve.

Father : Do you write what you learn?

Son : No.

Father : Perhaps, you forget your lessons because you don't write them. If you write the lessons after you've learned them, I'm sure, you won't forget them. 

Son : Thank you, father. From now on, I'll follow your advice.