Plan your story, thinking about its length. Jot down a rough structure. This helps you to get going. If your story is factual, start by giving some background information on your life before college. Write about any difficulties you had getting a college place, or any failures you had along the way. Include a brief account of how this made you feel. You want the reader to identify with you, and a dry factual account will not do this.
Introduce an element of suspense or conflict into your story. This could be a point at which your college career was not going too well, perhaps your grades were poor or you felt unsettled or lonely at college. Write about the measures you took to overcome the difficulties. If you had further failures along the way, describe these. This is interesting to the reader, and knowing that you met obstacles will make the readers more sympathetic than if everything went smoothly.
Add some depth to your story. Give details about the different tactics that worked for you. There are specific things that the reader will want to know about your college life. He will want to know, for instance, how you managed your workload. Readers often love to hear detail such as how you color-coded your timetable, or how you allocated time-slots to particular tasks.