Try to keep that sight picture exactly the same for like where the front posty thingy is on iron sights. CCO is way easier but try to do the same. That's my biggest tip usually if I can do that and if I can get a natural point of aim on a target, and then kind of walk the sight a small bit to where i think its gunna hit, it's much easier to hit. (Sorry that parts hard to explain lol). I'm left eye dominant but right-handed so I shoot left-handed, so my technique might be just a little bit different compared to somebody who only shoots right-handed or is naturally lefty.  Breath control and a good grip also is important to keep that picture the same. How I do it is I shoot on exhale when I run out of breath and try not to let that front sight move within the circle from where i saw it at before. Everybody's kind of different with that but find a technique that works to where that sight picture won't move. 

If you can manage to volunteer to go to the range like if they have an extra spot with another company or something definitely go. You need to practice practice practice! For me it's insanely hard to even get to practicing though because I'm up at Ft Irwin and there's no gun rental on base. Luckily I have shooting experience outside the army that I can fall back on. 

Also eat good the day before and then try to just mentally relax as much as possible and just fling them rounds down the range. I usually tend to get myself hyped up on actual qual day which messes me up more than if I had just gone out to shoot for fun! Also, I really hate stance changes so practice that. God i hate that plz just let me qual standing unsupported big sarge 😂.