Each student's acceptance ability is different, and the suitable learning style is different, so how long it takes to improve this varies from person to person. Some students 1 made obvious progress in February, and some students made outstanding achievements in three to five months. So there is no absolute improvement. It is more fundamental to decide according to whether the candidate cooperates with the tutor. When choosing training courses, you must do more comparison and audition, and don't choose at will.