TransUnion Developer/Testing interview questions

The first round was the Amcat test which consists of English, quants, logical and 2 coding questions (C, C++ or Java only ). Our second round was GD round of duration half an hour followed by a technical interview. The last round was HR round where I got rejected (unfortunately) and I still can't figure out why. I waited for 10 hours with an empty stomach and continuously revising our concepts to hear this result.