Play smart. Practice a lot. Take some lessons. There really isn't a lot of specific advice I can give you without knowing your game or how you swing the club.

Know your ave distance with your clubs.  Not your best which is only once in a while.  Know the green and where to put the ball to score.  Smart play is better than risk taking.  I found I was hitting at pins but my distance control was off and ended up with a lot of down hill putts.  They get tougher and lead to three putts, started playing a little below the hole and have had a lot more good opportunities.  Practice your ground to ground distance with each club.

thanks for that last comment about being quick close to the green: I know this in my head, but having it pointed out and knowing other good golfers have the same issue makes it more clear: SWING THE CLUB

thanks

I think more birdies come from risk taking. You are not trying to avoid penalties and bailing out, you are trying to nail the hole with the best possible score. Taking that into consideration, I believe you just have to practice until high risk shots do not feel like a risk at all, so you can attack with confidence.

But hey, If that's you winning the Magnolia Grove Junior Classic, you are already on the right path, just give it time. Physically your body is still growing. Soon you will be able to reach all the par 5's in two, no sweat. Then you'll complain you aren't making enough eagles. Just try not to be so hard on yourself, since you are probably going to have to go through the growing pains of having to adjust to increase distance gains.

Swing conservatively, especially on the par 3s. I know I'm capable of 200+ with a 7 wood but play it 180 (I've hit one 225 before).  Also capable of 130 with a 9 iron but play it about 120.

Most of your practice should be with your wedges and short irons.

There are no short cuts to making birdies,practice practice and more practice, I like to go out to the course at twilight  on a slow day and play anywhere from 150 yds and in.and work on my short game on the course.Yeah you could hit those shots on the range,but I get to play the course,practice different chips and get a better feel for the greens and where I want my shots to hit on the green.If you got a partner to play with make a competition out of it closes to the pin. etc I also work on fairway bunker shots greenside bunker shots ,just depends what I want to work on.Remember this is just practice.

That and spend more time on the chipping greens and putting greens at the course.When at the range spend more time dialing in your wedges.Good Luck. and above all have fun.

My main points for scoring better from 150 yards and in are simple:

First of all, you should know the exact carry and total yardages of your irons. Usually, if I have 145 in and my nearest club goes 140 (an 8-iron) I will not club up and I will make an agressive swing with my club. Second, making birdies starts with good position off the tee, and even if it means sacrificing ten yards off distance, try hittting a three-wood. But most importantly, I think putting is the key. It is where the best pros excell and win tournaments. Mainly though, focus on straight solid shots and you will find yourself making a lot of birdies!!!

Just something to think about from a non-expert senior player.  150 in is my favorite part of the game.  Where I learned to score better was to cut down my backswing on the short irons, the 7 thru wedges.  I use a three quarter swing where the clubhead comes to about shoulder level and then I accelerate through the ball and finish with a complete follow through.  My distance is actually almost the same as with a full swing, but far more accurate.  Also, with the three quarter swing my ball hits and stops which I like because it is more predictable, full swing it will usually spin back.  Bottom line is that I get shorter putts this way and give myself better chances for birdies.

Someone mentioned going out at twilight and practicing.  That is what I love to do when I can get time... mainly due to the fact that the range is level and fairway cut.  I play many many shots out of the rough and want to practice that, although I also need to work on being in the fairway. 

I also hit shots from the Red tees on par 3s if I am playing with my wife and not pushed for time.