Hi, your CGPA is good enough. Coming to your GRE score it falls under the range for Johns Hopkins university. Try getting 1 LOR from HOD if you already have that great. Usually everyone takes LOR from PhD holders of the college. So, you see if you have those. The LOR from an IIT Professor will have a great impact. Make sure that you enhance and write about your paper in detail in the LOR as well. Your internships are great. You can also ask them to give you an LOR. If not it is ok. Overall this person has a chance of getting into the college as their range of accepting marks of GRE is around 150. Hope this helps.