Use the "Utility Category" limits in the aircraft's POH, for all training flights: including students under training, flight tests, school check flights for qualified pilots.
The main restriction outside the utility cat. limits is normally no spinning/aeros, though the POH will normally specify what is and is not restricted. If you checked it and found you were only in "Normal" on a check/training flight IMHO the appropriate thing would be to bring this to the instructors attention. You could for example be doing Instrument training with others in the back of the aircraft which puts you outside the utility cat. but no problem just flying around like this practicing approaches
