If you already know of somebody (such as juniors, student's union, alumni association ...), ask them to help you; that will be the fastest means of getting it done. The other option is go to the nearest indian diplomatic outlet (embassy / consulate) and tell them all these stuff. I cant predict how those in the US will behave but the one located in Vancouver (Canada) did help one of my friends (who is an indian but told me that the proces is same for all) to get it done and they also gave him a receipt of application for police clearance certificate (which assured him at least). They dont need police certificates at the *beginning* of the application process but they might ask it at a later time. All the best Keep rolling...