Some interior design training can be done one on one at the location that you get a job in. For example, you may want to get a job with a firm and forgo some of your educational training for on the job training which may provide you with more real world experience.
Prerequisites for interior design training are most of the time pretty basic. Find out if the school that you are considering will have specific needs for you to meet. When this is the case, making sure that you meet them before you apply helps you to excel.