AO都是老司机，太阳底下无新鲜事。看来你没有深刻理解原文的意思

Nothing can really surprise an AO.

When we say surprise, it is in the CONTEXT of that particular student.

When AO looks at the numbers, he/she will construct a picture of who the student is.

However, as the AO digs deeper through the app, he/she finds the student has a lot more than what the numbers reflect. That positive "surprise" is what makes a student interesting.