Sara Ege used a stick to beat seven-year-old Yaseen like a dog if he couldnt recite passages from the Islamic text.
The beatings were so brutal that the boy died from his injuries, and his mother tried to burn the body to destroy the evidence, Cardiff Crown Court was told.
In a video recording of her interview with police, Mrs Ege told them: I was trying to teach him the Koran.
I was getting more and more frustrated. If he didnt read it properly I would be very angry I would hit him.
We had a high target. I wanted him to learn 35 pages in three months.
I promised him a new bike if he could do it. But Yaseen wasnt very good after a year of practice he had only learnt a chapter.
The court heard Mrs Ege, 32, a university graduate, and her husband, Yousuf, had enrolled Yaseen in advanced classes at their local mosque.
They wanted him to become a hafiz an Islamic term for someone who memorises the Koran.
Yaseen was coming to the end of a three-month trial period at the mosque, and Ege was keen for him to impress his Imam.
She also hit him with a hammer, a rolling pin and a slipper, as well as repeatedly punching him, the court heard.
She would allegedly lock him in the shed, tie him to a door, and force him to do press-ups.