It took me more than 4 months until an invitation for an "interview". When I arrived, i was asked to waif and about 30 mins after the scheduled time, all the candidates for the same position were gathered in a room to do a test, a math test. It was a mathematical question combined with elements of physics and you have to know the formula to complete the question. There were no extra papers given, no calculator and you are not allowed to write anything on the question paper. Only 30 minutes was given for this test eventhough the paper initially stated 45 minutes. The HR said that no points will be deducted however it does not seems to be so. Only people that passed the test are being interviewed while the rest did not have anymore chance to prove themselves.