Question
I have a very tall corn plant (10ft) and the lower leaves are fine but the upper part of the plants leaves have dry spots and look bad so I wanted to prune the top off and let it regrow. I know it will sprout to the side but is there any way to know which direction it will grow? (like roses grow on the side where the previous leaf was)

Answer
Usually corn plants loose their leaves from the bottom up. This is natural. So, I am trying to figure out what is causing yours to show such damage on top. One thing you might check is whether it is very hot 10 feet up near the ceiling. Dracaenas like high humidity. I put water and a humidifier around mine, and I don't have the leaf drop and browning that I had before. If there is a ceiling heat vent, it could cause damage as well. Stop the damage before you cut the plant, or the new growth will also get damaged
Corn plants are a whole different plant then a rose. Instead of a branch starting at a leaf node, like with a rose, the corn plant will usually send out two, or three, even four branches from one cutting. As long as you have leaves that are good, you can cut it anywhere above them and it will continue from there.
The best way to see where to cut, is to stand back, and examine the best starting point on the stem for it to continue. Then make a clean cut straight across, don't angle it. Keep the cut slightly moist, so that it doesn't shrivel up. After the new growth gets going, the lower leaves may turn yellow and come off. This has happened with some of my plants, but not all of them.
I hope you have high ceilings, because it sounds like you are going to have a very tall plant.