Is Mr. Xuebajun's teaching method meticulous? My niece's math performance is not very satisfactory, and she wants to make up for it.
Xuebajun is an extra-curricular cram school to consolidate and improve every student's study, so the teacher will give you special guidance no matter whether the grades are poor or good. I've been through this situation like your niece. Anyway, you can rest assured that the teacher will diagnose the reason and give you correct guidance.