Beckman Coulter Diagnostics interview questions

The process is not too difficult but they hire only one student. I don’t like this thing about the company. As there are basically three rounds. If you qualify the interview round then the hr round and even if you qualify the hr round. They put another round which is online. And i got failed in online round, i am really heartbroken as i was just a step away to get this job. And I really wanted to work in biomedical sector but somehow they did partiality or what can I say? My interview went well, I had given all the answers with honesty but still I am rejected, I can’t describe what I am going through. If I got disqualified in the initial technical interview then I won’t be sad that much.. but now it’s like that what went wrong? Like I am not able to understand, if they want a boy from the starting or something like that then they shouldn’t conduct this rounds and all. I think they shouldn’t do this to anyone bcoz it really hurts when you are capable enough and you really wanted to go into the healthcare sector but somehow you can’t get that job bcoz of just one person who takes my online interview don’t like me or something whatever I don’t know.. I am really frustrated right now as I really wanted the job and I always had an interest in biology. I know life is not over now and I also know that whatever happens, happen for the good. But when someone did their best, and if the company wanted to choose one person only then they should just do it after the hr round. Why do they need to take final round as I don’t like their process tbh.. they are doing really wrong