High school trumpet players range?

for a junior i would say pedal C to high D. what works for me in practicing for range and endurance is lip slurs and arpeggios. for the arpeggios start on the low F sharp and end on the F sharp at the top of the staff.then continue with G then A flat ect. keep going until your break ( when the notes dont come out anymore). take time to rest and play some pedal tones to loosen up.