Pass accurately, even on set plays

To score a goal on a corner kick, do the easy and obvious: kick the ball to your teammate.

Yes, this is easier than blasting the ball into a crowd, and much more effective.
step one: pick a teammate you want to get the ball to.
step two: kick it 3-4 step in front of them.
step three: let them run on to it and get their shot.

If there is difficulty it is in placement of the corner, but that is easier when you mentally have a spot you are kicking it to instead of just into a crowd.
Nice goal in this 20 second video.