If i grew 4 inches from ages 12-14 is it possible to keep that linear growth for another 1-2 years? for ex. 2 inches from 14-15 and 2 inches again 15-16. i started puberty at age 10 btw?

The expected growth rate is 2.5 in/yr with some experiencing more during puberty. When it slows, and it will, it signals the end of linear growth. Early onset puberty often means it ends sooner. The only valid way to predict more height is to x-ray the wrist/hand & study the growth centers therein. When they close, growth will stop, when open, more growth is possible.