The first step in getting an F-1 student visa is to be accepted by an American school. This can be either a college/university, English-language program, or high school. The process for being accepted into one of these programs is dependent on the program.
Next, your school will give you an I-20 form. Once you have your I-20, you have to gather some other required documents:
Required documents for F-1 visa interview in South Korea
Additionally, there are some recommended documents that you can prepare to make your visa interview easier:
Be prepared to state clearly your educational goals; your major; why you chose that major; why that major is important to your future career in your home country; your graduate school plans, if any; how your degree will help you when you return home.
If you answer the interviewers questions to his/her satisfaction, they will inform you at the end of the interview if you will be receiving a visa or not. If they will not grant you a visa, they will tell you why. You can gather more evidence and schedule another visa interview later to try again. I think that if you fail two interviews that there is a mandatory waiting period of some time before you can have a third interview.