there's still a chance for you to maximize your growth op
i've seen a great difference in my classmates from when they were in 10th grade compared to how they are in 12th grade
1. eat a balanced diet with a emphasis on calcium, vit. b12, vit. d
2. play lots of sports with a emphasis on jumping or leg work especially basketball, cycling and swimming
3. go check with your doctor to see if anything is wrong with your thyroids. if there is, it may be inhibiting your growth
4. go to sleep at 9-10pm. lame but human growth hormone factor is secreted during this time
5. sleep for at least 7-8 hours a day
i wouldn't attempt the stretches yet since you're still growing and most of them have a emphasis on increasing the space between your vertebrae.
you may be 2-3 inches taller but you'll have a disproportionate body unless you have really long legs now. save it as a last resort