I'll add a new point no one has yet raised based on a clue in the puzzle:

The professor calls in

Student 2(red line).

Reasons:
1.

The data seems to be related to the age somehow. Why otherwise would someone want to tell the person's age to the puzzle solver? The age has to be related to the data, in a way that cannot be altered. Or, if this seems to be too far-fetched a claim, at least the last point.

The person is the only one given from a rich family, so he paid someone to take the data for him. Or didn't value the education was getting, and copied the data without understanding what it means.

Based on this, in the data:

The real data-gatherer must be around 33-34 years of age. Red is the only one which the last point doesn't correspond to the candidate's real age.

I'm not sure about the nationalities, though. Maybe the ways the universities work?

I'll add a new point no one has yet raised based on a clue in the puzzle:

The professor calls in

Student 2(red line).

Reasons:
1.

The data seems to be related to the age somehow. Why otherwise would someone want to tell the person's age to the puzzle solver? The age has to be related to the data, in a way that cannot be altered. Or, if this seems to be too far-fetched a claim, at least the last data point.

The person is the only one given from a rich family, so he most likely paid someone to gather the data for him. Or didn't value the education was getting, and copied the data without understanding what it means.

Based on this, in the data:

The real data-gatherer must be around 33-34 years of age. Red is the only one which the last point doesn't correspond to the candidate's real age.

I'm not sure about the nationalities, though. Maybe the ways the universities work?