Questionable selection process leads to unfair rejections - Full Stack Developer RBHU Analytics Employee Review

They reject me at the interview because I was late 15 minutes,and never understand on which basis they select the students..many students doesn't basic code like how to reverse the string and how to declare the hashmap,they doesn't know mongodb follow ACID properties or not still they select the students,many students add some fancy project until they never know about them , still they select them