Question 073: Better sparring

I am 17 years old. Question 1: How can I improve my control when sparring? I keep hitting people when I don't mean to. Question 2: What is the best way to improve my flexibility? I have good flexibility and can kick very high, but I cannot do full splits and can only hold my leg out at a 90 degree angle. I see the fantastic kicks some martial artists do and I want to be that great. I have my first tournament coming up in June and I want to win.