If you want something to happen then there is a procedure to achieve it. If you follow the procedure, then you will achieve that which you desire. Though this is the system of Allah Ta‘ala, one should bear in mind that Allah Ta‘ala is not subject to any system and procedure. Your work is to join the line and then it is the choice of Allah Ta‘ala as to who He wishes to give preference to. One cannot question the decision of Allah Ta‘ala.
It is like a worker who comes to seek employment in a company. Once he is given a duty, he needs to see to it that he does his work. He cannot ask the manager of the company as to why does another person have another position, for the manager of the company feels that he cannot be questioned, since he has all the authority and control. So when you cannot question the manager who is a human like you, then how can you question Allah Ta‘ala?