I would encourage you to familiarize yourself with Monster.com's Career Advice webpage because there is all kind of great information there dealing with interviews, including Interview Preparation and Interview Appearance. https://www.monster.com/career-advice/
Keep in mind that you are a college student so you will be applying for an internship or coop or something like that. Interest in the internship job that you are applying for is important, so it would greatly help to figure out what you want to do when you graduate college (or at least narrow down your options) so you can find an internship in that field. For example, if you know that you want to work with cars, you will want to apply for an internship with an automobile company or a supplier to an automobile company. Your interest in cars will be discussed in the interview and you will want to communicate that interest and how you are taking (or plan to take) courses in college related to cars.
After you have established interest in an internship job, you'll want to create a resume that demonstrates how you meet (or exceed) the requirements that the employer is asking for in the internship job posting. You want a nice, clean, simple, one page resume. Only apply for jobs that you are either completely qualified for or mostly qualified for. If you are not at all qualified, don't apply. Your qualifications will be discussed in the interview.
Finally, show-up to the interview on-time and looking nice. Buy a suit package (suit, shirt, tie, pocket silk, and shoes) and wear it to the interview. It will communicate that you are serious about the job. At a bare minimum, wear a shirt, tie, and pants. Remember, you never get a second chance to make a first impression.
I hope this helps!!