Same story is of my senior Amol Bhave. He attended the Circuits and Electronics course from MITx, but when he found that they are not going to offer Signals and Systems course (the next in the series), he himself built a platform with course material from OCW. And, he got in MIT Class of 2017.
[1] http://www.ft.com/cms/s/0/c5a4b932-924c-11e2-851f-00144feabd...