about transcript/diploma

看到学校开成绩单的要求,不知如何操作,请提供点建议,谢谢!!

原文如下: To the School

please enclose this form with one official transcript /diploma( if your school policy allows)in the envelope provided. if no envelope is provided, please use your institution's standard business envelope and address to the applicant. please seal the envelope and sign across the envelope seal. return the sealed envelope to the applicant so itcan be include with his/her application. please do not send the transcript directly to the BS

1, please explain the grading scale used in your college or university?

2, what si the highest grade usually received?

3,what is the lowest grade usually received?

4,what is the average grade usually received?