Display records by date not in a group in SQL Server

I have a table containing information for students.

Id           PupilId     Class      Date           Group

1            10           Class 1   2022-12-09               

2            12           Class 5   2022-12-09

3            80           Class 1   2022-12-09 Groupname

4            86          Class 1   2022-12-09 Groupname

5            90           Class 1   2022-12-09 Groupname

6            60           Class 1   2022-12-09 New Group 

7            72           Class 1   2022-12-09 New Group

There is a field (pupilgroup="Testgroup" ) used to group the 50 students if they are in a group and if they aren't in a group its blank.

In SQL How do I display all students by date not in a group and only 1 from the TestGroup.

I would like it to display the Description for (student name, Class, room), show Group (blank) for the students not in a group and student name (blank), Class (Blank), room (blank), Group (Description) for the single entry.