Don't force your child to study only one subject at a time.
Studies show that humans learn better if they study two or more subjects at a time. https://mcmanusbatchelor75.bloggersdelight.dk/2025/02/06/is-parenting-leaving-you-feeling-stressed-out-and-overwhelmed-do-you-worry-that-youre-doing-everything-wrong-parenting-can-be-incredibly-frustrating-but-it-can-also-be-very-rewarding-in-this-art/