Hard Work/Talent/Luck what is the main reason of people's success in life?

I've been thinking about this for a while and I've always wondered how are some people able take academics for an example. Someone could be studying day long and still struggle to get that information in their head and they still fail their exam whereas someone else who studies everything last second and somehow still manages to ace it. Is it the fact memorisation is their talent, or did they get lucky? No matter how committed you can be stuck at a point where you can't retain anything anymore and it's all too much and it starts overwhelming you but then someone else doesn't even have to try and produce far better results.

Even in sports did the people who made it make it through hard work? Did they get lucky or were they just insanely talented to make it? Someone else could be out there working 10x harder quitting school to pursue sports but still can't make it to the level they want. Is it due to lack of talent? Are they unlucky or are they not working hard enough?

I've always wanted to find an answer to this. Same thing can apply to multiple different areas even starting a business, etc. What are these people doing to get that level is it the fact they're overworking themselves, did they get lucky or are they just insanely talented?

What about the people who are working harder than the ones who made it but they're stuck at a certain point and can't improve any further and get to the level that they want? There has to be an answer to it. Are these people going to be stuck forever and they're wasting their time doing all these activities just to be stuck and not improve? There has to be an answer to this