My son struggled with problem-solving too, especially the word problems where you need to visualise what's happening. When we looked at tuition, we prioritised finding someone who could break down the question-type patterns rather than just drilling answers, because once he saw the structure, he could apply it to new questions. Some tutors focus heavily on speed drills, others on understanding, and honestly both matter but we felt understanding came first for him. Have you tried working through past papers together to see which question types trip your child up most? Sometimes that narrows down what you really need help with.
yizhen li