The best way to do this is to run the Custom Grids report. If you go to Reporting>Reports>Students(tab)>Custom Grids
You can give the grid a title (e.g. Parents Evening), Split by Form and add a column prior to generating the report (you can also give the column headers a name here too), you get this output:
Alternatively you can use the Current Forms Group Report (Reporting>Reports>Students(tab)>Current Form Groups) and run this report to split by Form. You will get a form list with five additional columns which you can label if you export to excel (plus delete any columns you don't require).