Automated Script Fill in Form and Press Submit Every 1 Mins

Hello, So I missed the course deadline and now I am not on the list to take the course I wanted to take. Usually, people will drop the course when they change plans later. Once they drop it, a space becomes available. To register, one must put the course number in a box and press Submit. I was hoping someone can make a script that would input the course number and press submit every 30 sec - 1 min until it actually worked because someone dropped out. Once you press submit an error message comes (because the course is full now) but you are brought to the same page so the script can just do it over again and again. Thanks!