Unable to export an excel in a customized format

I need to export data in a excel.

Currently I am able to export data in a excel in the following format like 

Name Roll Age Phone Teacher
student1 1 13 9876545666 Ram
student2 2 13 4234234234 Ram
student3 3 14 7655578883 Ram


But I want to display in the following format:

Teacher Ram    
Name Roll Age Phone
student1 1 13 9876545666
student2 2 13 4234234234
student3 3 14 7655578883


Like here,Ram is the teacher which appears in every row.

But the requirement is we want it to appear in the top of the  excel.

Currently I an using ExportableDataSubset here.

Please help on this.

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