They will shortlist 30 people from your college and split them into 3 groups , according to the posts available with them, If you are selected for sales they will then call you at their company and have an e-mail writing round , (again shortlisting will be done), followed by that they will have a personal interview round. If you are a male and applying for this post don't keep any hopes as they only need females for this post. You would be rejected for no reason and the HR will give you any vauge reply for rejecting you. Also they will waste your entire day just to interview 10 candidates, really hopeless management.