It's going amazing dude. Keep it up. I remember when my hair was the length of yours when you have it cut. I have mine as well, but then I let it grow till today. It's almost on the knees. :) Keep it up brow.
You lucky man. Some schools don't allow hair past the collar, like mine. Although, I will be trying to grow it out long now since I'm not restricted anymore from my new school. I'm aiming for about a foot of hair. Right now, I actually have a mullet so I already have about 6 inches in the back and about 3 in the front. I'm guessing that by the end of 2015, I will have reached my goal.