I am an above-average student in my class.(这个是最地道的表达法) My remark is above-average in my class.

  My records are just so so.

  My records are between C+ and B- in class. +念做plus，-念做negative 欧美修学的学分不像中国有具体的分数，都是以A，B，C，D，E表示优秀，良好，中等，及格和不及格。学习成绩，老外也不说什么achievment，中等以上可以有C+或者B-来表示。

  My results is at middle of class