The Maker of this world has made a pair to this world. One member of this pair is the world where we live after birth—the planet Earth. The other pair is the world where we go after death. These two worlds form a pair. In this way, man's life has two parts: the pre-death and post-death periods. Man's Creator blessed him with life, dividing it into the pre-death and post-death phases.
The world before death has been made as a testing ground, and the world after death has been made for receiving reward or punishment. Because the present world is designed for the purpose of test, everyone has been given freedom here. Here, everything has defects and limitations. It is as if this present world is a sort of examination hall. Here, all those 'things' needed to 'write' the 'examination' are available, but the higher 'things' are absent. If a student wants to build an ideal world in the examination hall, he will surely face only despair and frustration. Similarly, those who seek to build a perfect world in this limited and temporary world of test will face sorrow and disappointment.
While we are in this examination hall—this life of ours on planet Earth—what must each person do to obtain the perfect world they desire after death? The answer to this question is that we must use our freedom according to the Creator's Will.
For life after death, God has made a perfect world, Paradise. This Paradise is, in every sense, an ideal world. God will lodge such people as prove themselves to be eligible to be settled there. In the present world, those who qualify themselves according to divine standards will be settled in the ideal world of Paradise.
Now, who are those people who will qualify for Paradise? These are the ones who, using their intellectual capacities, attain the realization of God. Coming out of intellectual confusion, they discover the truth. They devote themselves to God alone and worship none but Him. Despite possessing freedom, they let themselves willingly be regulated by divine discipline. Faced with adverse conditions, they build in themselves a positive personality. They deal with others in the same ethical way they want others to deal with them.
All these qualities are the criteria set according to God's creation plan for an individual to be eligible for being settled in eternal Paradise after death.
Source: God’s Creation Plan