expanding your range

hi camille ive watched many videos and i have read all th blogs but in your way of saying it how would you explain how to expand your range and is it still possible for me at the age of 12 to reach as high as a vocal range as ariana grande

I can't predict how your vocal range will change as you age and continue to train! But the principles of range extension are to go slowly, start with closed-mouth exercises, stay relaxed, and gradually open up to vowels.