Unable to Complete MR18 test

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The test is not progressing.I've killed 720 enemies so far and still it shows 0/5.I really don't want to quit.I've no idea what I'm doing wrong.
Please,any kind of help would be nice.I'm stuck here

Edit :- Nevermind,gave up and aborted after waiting 40 minutes for an answer.

Edited November 24, 2016 by Suv8894

[salubri]

its an old bug, that have been reported before, try to set your matchmaking to solo the next time you try the test

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@salubri Thank you for the info. I'll try that the next time I attempt it.