i know some of the spelling is wrong
i can hit three c above the staff but i can't stay high

try heroin

Buzz the high C everytime before playing. whenever playing a score, try practicing (if possible) an octive higher.

play down low, lots of pedal tones, lots of these creates a good embouchure for higher register playing, also jst pratice loads but dont wear urself out.

since most people that reply on here are just amature players, I suggest you check out some recordings of professional players with great chops such as Wayne Bergeron, Maynard Ferguson, or Pat Hession (Pat also has a method book for developing "invincible" chops at www.hessionssessions.com )... they are all on youtube

your lip muscles arent strong enough. Embrouchurere isnt built by playing a few high notes (i. e. going to a high C once). It is by playing high (not extremely high) for an extended period of time. Unfortunately, embrechoure isnt built overnight.. it takes a while. but once you build your emrechoure the ability to hold high notes comes with it. (for example i havent played regularly on a trumpet, but i know how to... I can get to a high C but I cant stay there because I dont play trumpet regularly)

Remember that only playing high can damage your chops and lead to a poor lower and middle register... Most people recommend only 15 minutes of focused upper register practice a day with the rest of your studies focused on lower register, soft, and melodic playing. Remember that to have a strong upper register you need have a fat lower register.

P.S. buy Pat's book...it'll do you wonders

Curis why do you always say 'chops' why can't you just say 'lips'

have you ever felt that something someone said was just so dumb that you had nothing to say back to them?
I imagine thats how curtis1234 feels right now

haha so true trumpetfool

lmao

You could try warming up with scales going up to the high range. The notes will seem more secure and easy.

i met p. hession, he was in that maynard band or something like that, i met him when i was in florida doing a gig i would also recommend mr. hession