I think Cornell and Brown are unrealistic. JHU might be in the realm of possibility if your internship advisor/professor really liked you and goes to bat, but still a long shot. I think there is a good chance you will get in to at least two of the others if you rock your essay and have strong LORs and good GC recc (possibly putting a good spin on your lower GPA in 10th,11th.) And you still need a couple safeties too. Good luck.