Hello! I currently do research for the physics department and also the chemical engineering department of my university (ranked within top 100, if I remember correctly, for context). I should be publishing at least three or more papers through this research during my time here, though I'm shooting for around five or six if results all go as expected. I was told by the chem.e research head that being first author on a publication is nearly a guarantee into any grad school program that I want. How true is this? I'd like to go for a top 15 school if possible, but my GPA will likely be around 3.5 by the time I graduate if I'm being fair. My GRE should be decent (I always score high on practice ones) and I have a ton of extracurriculars and leadership roles, as well as work experience. What do you guys think of my chances, given some pretty vague information?