Provided a test link which had 3 questions based on data structure.Solved 2 of them and half of the third one.Then due to some unknown reason there platform stopped working and I was not able to write.Mailed the HR for this problem but no response.Then,waiting for around 3 weeks again contacted the HR but nor reply.This behaviour was not expected by Hashedin.Very irresponsible behaviour by HR.Don't feel relaxed that HR contacted you.They can stop responding you anytime.