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You no longer can get 5 passages. They are now only giving one extra (or "dummy") passage to students for research purposes.
Unfortunately, you CAN'T know which 3 are graded and which 1 is not -- if students knew that, I doubt very many would spend any time (or effort) at all on the extra passage. They only method I know of that will work at all would be AFTER the test if you ask other students what their 3 reading passages were about -- through a process of elimination you would figure out which of your 4 was the "dummy passage."