Every child learns differently. In a classroom of forty students a teacher cannot pause for one child who has not understood a concept. This is exactly the gap one-to-one tuition fills.
Personalized learning starts with knowing where a student actually stands. A good tutor spends the first few sessions identifying gaps rather than racing ahead with the syllabus. Once those gaps are clear, the pace can be set by the student rather than the calendar.
The second advantage is confidence. Students who hesitate to ask questions in class will ask freely when only one person is listening. Over a few weeks that willingness to ask is often what changes a grade.
Finally, personalized learning allows the method to change. Some students understand mathematics through diagrams, others through repetition, others through real-life examples. A tutor teaching one student can switch approaches until something clicks.
If your child is struggling in a subject, the problem is rarely ability. It is usually pace, confidence or method, and all three can be fixed with the right tutor.