What is the ruling of Islamic law and what is the optimal action to take in a situation where my nephew's memorization of the Quran conflicts with his declining academic performance, given that he is 12 years old and facing important school examinations?

Raising children upon the religion and having them memorize the Quran and Sunnah is an obligation upon parents and a source of good in this world and the the hereafter. A Muslim must balance the affairs of this world and the hereafter, not forgetting his share of this world but prioritizing actions for the hereafter. A Muslim can combine memorizing the Quran and reviewing school lessons by organizing time and dividing it between memorization, review, and rest, while considering the child's capacity and comprehension to avoid pressure. It is advisable to reduce the daily amount of Quran memorization to allow the student to study for school, without eliminating Quran memorization entirely. Parents should organize the child's time to blend Quran memorization with improving academic performance without compromising either.