Going on a drop tower isn't that bad. It just takes you up and drops you. Since you are going on a 325ft tower, it will only last for about 3-4 seconds. It lifts you out of the seat. You WILL scream when you are falling and while you scream you barely even notice you are fallig. The trip up to the top is the worst part because you dont know when it drops you but when it does, that's the fun part. So don't worry and just have fun!
P.S Whats the name of the tower your riding. 325ft is pretty tall for a drop tower!