Why is life full of challenges?

The world is the place of work and paradise is the place of reward so we need to work now to get some reward later.

Its like the farmer who prepares the soil and plants the seeds then nurtures the buds and hopefully he shall see the result of his good work.

We only reap what we sow is a popular saying but for a Muslim it can be ten times any other people and even more than that if planted in Ramadan or other times.

There is a famous Arabic saying, "The world is the plantation field of the afterlife."

The place that we'll get what we want is paradise, we will get what we choose, paradise is the place when we can get what we want. Only thru believing that there is one God/Allah and Muhammad (peace and blessings of God be upon him) is the final messenger.