Practice your job search every day
It may seem weird and maybe even unreasonable to practice your job search every day. There's so much that goes into it: resume and cover letter writing, interviewing skills, good posture and eye contact, even dressing appropriately. How can you possibly practice all of that every day? By living out the skills, experiences and professionalism you are trying to convince employers that you have.
Some of this is obvious and is usually accounted for. If you say you have critical thinking skills and you use them at work or in class every day, then you got that covered. But other things, such as behavior, dress and posture, can sometimes be a little lax when you aren't in the spotlight. But, like they always say, practice makes perfect.
If you show up to meetings with professors or other staff members on campus, then you will be practicing punctuality, both for interviews and for your job. Don't go out drinking the night before an early morning meeting (I had a student show up hungover one morning and she threw up in my office. Safe to say if that was an interview... she wouldn't get the job). If you can't make a meeting, hungover or otherwise, contact that person and explain that you can't make it. They'll understand and will appreciate not sitting around for you. Also, when you meet someone new, or are talking to someone in class, practice good posture and eye contact. Even if you're not meeting with someone, going out in public looking like a slob may look bad if you run into a potential employer. You don't have to dress like Barney Stinson everywhere you go, but those sweatpants with the holes in awkward areas probably aren't the best option.
All of these things allow you to practice appropriate behavior that you will need to use for interviews and in general in the workplace. The more you practice it now, the more comfortable you'll feel doing it and the less different it will feel to act that way.