Signs of mild-to-moderate impairment include continual and significant academic underachievement as well as evidence of mild neurological or functional impairment.

轻到中度受损的表现包括持续而明显的学习成绩不良同时伴有轻度神经和功能受损。

youdao

There was also significant difference in the two scores of the academic underachievement students of different school grades, and the difference tended to increase with age.

各学习年限段学业不良学生间在这两方面的得分差异显著，呈随年龄增长而增长的趋势。

youdao

In terms of academic results, inspectors found underachievement at GCSE level in this sector, with evidence that pupils are on courses for which they have "little realistic chance of success".

BBC: London colleges lack 'strategy'