Life’s Learning Process

Life sucks. Why is it that we are given the test first, the lesson afterwards. Shouldn't it be : present the lesson first, have a review then take the test afterwards, just like in class? It's not fair. In some instances, when you fail the test, you can't make up for it anymore. No re-takes. You are marked for life. Why do we know the value of something only after we've lost it? Can't we just intrinsically know its importance from the start so that there would be no regrets? Can't a bell toll if we are taking things for granted? I guess that's life learning process. Life must be lived forward, understood backwards………