What is the value of the worldly life?

An exam is meant to distinguish between the students and classify them into levels and degrees before starting their new practical life. Despite the shortness of the exam, it decides the student's future towards this new life that he is approaching. The same applies to life, despite its shortness, it is an abode of affliction and trial for mankind to be classified into various degrees and levels when heading towards the Hereafter. Man leaves this worldly life only with his deeds and not with material things, thus, he must understand that he has to work in this life for the sake of the Hereafter and seek the reward there.