Class prep is officially upon us and we are so ready to start back to school shopping! First step: stock up on the must-haves. And what’s more essential to any back to school wardrobe than denim? Nothing, and we stand by that. From ripped skinnies for the weekend to the perfect jeggings, denim is the ultimate way to complete your best looks. That’s why we’re running the rue21 Denim Sweepstakes. We know how important it is to look and feel your best when you head back to class, so we whipped up this pretty dope sweepstakes that we think you’re gonna love. Basically, we’re helping you crush this school year…