Growth plate closed???!

about 6 months ago, my mom took me to a doctor and he did an x-ray on my foot and my arms to determine if i can grow in the near future!. he said the growth plates on my legs are closed but in my arms, i still have a chance to grow!. is he right/accurate!?!?!?!? too bad i still didn't grow over a 6-month period!. i'm still 5'6 3/4 and i'm 15!. do i still have a chance to grow!? the problem is - i wanna grow fast during high school!. not after i graduate!.Www@Answer-Health@Com

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