In my opinion, most of the part depends on luck in success. Although one has excellent intellect or talent, it also belongs to luck. Therefore, I'm not a fatalist, but almost everything require luck, especially success, exam pass, etc. So, you do not have to be too discouraged. Everyone has their own luck regardless of our will or mind. But what we should not forget is our effort! It is also one of the most influential causes of success. I think probably luck comes if our effort is at least 1%, not zero.