Look at what I said:
First, children with low consciousness are more suitable for one-on-one. Because the teacher's attention is only on one classmate, the students' every move can't escape the teacher's eyes, so that the children who take math lessons in Grade One can get rid of the bad habits in primary school faster and enter the role faster.
Second, children with obvious loopholes in knowledge points. Teachers who take classes as units pay more attention to balance and less attention to individuals. If children have obvious loopholes in knowledge points, they may not gain much. My son just asked me to send him to excellent education for one-on-one math tutoring, because he didn't attend the bridging class and there was a gap in knowledge points, which these ordinary classes might not take into account. The teachers there are very responsible and will give us feedback regularly. Of course, my son's grades have also improved.