How do i become a better golfer?

im a junior golfer, ive been playing for about 14 months and i started on a handicap of 31, my handicap is now 10. I practice as often as i can but i also have to do well in school as well. The course i play is a par 67 and my record is 70 around it. i played nine holes once, where i shot 2 under the card on the front and then mucked up the back. what else can i do to become a better player?