Mobile Programming Software Developer interview questions

I got call from HR, before arranging an interview HR calls to many times for scheduling the interview time slot and after scheduling interview slot, on interview day too many time reminds for it. But at the time of attending interview and waiting for joining the panel 20 min they did not respond. And when contact with HR person then that person didn't aware about that. So don't know why they asking candidates for interviews and not conducting it. Wasting time of candidates. Very bad thing.

3 rounds, Won't process faster, interview was moderate 1st round was i-Mocha test, followed by 2 rounds of technical interview and finally hr round. first they agreed for wfh then they called for office daily..