So much depends on your physical development – IE – how much growing you have left to do, and how much speed you have to gain. I’ve seen plenty of people improve 0.5-0.7 in a season at that age, but seems to happen more often from the 12.5 down to 11.8 and 12.0 down to 11.3 range. Moving from 11.3 to 10.7 is a lot – but like Nick said, if you work the right things is certainly doable. (It is only a 2.5 step difference – keep turnover the same, but get there in 2.5 fewer steps).
If your start is weak, there is probably a lot of time to be gained by getting out of the blocks more powerfully.
How would one be able to tell how much speed/growing is left, any “hints” or anything? Im fairly mature for my age, but i doubt completely matured…