Give Your Best in Everything You Do
The first is that you should constantly put in your best effort and work hard. Whatever you accomplish in life, if you constantly give it your all, the results will be much better than if you don't. Giving everything, you do your all ALWAYS leads to bigger and better things in life.
In this world, those that go above and above are typically rewarded with higher jobs or raises in compensation. It goes without saying that those who work harder, study harder, and give more of themselves will always receive more out of life than those who take it easy.
Give your best effort and everything you have to get the greatest outcome you can. If it doesn't work out, at least you can be proud of your efforts. At the very least, you will have gained as much knowledge as you could along the route. People who are dedicated to continuing their education are virtually usually those that advance professionally and socially.
The second thing I must say is that you are too young to worry. Save that nonsense for later in life, once you have children and financial obligations. Just put in your best effort and wait and see for now. In time, your path will become clear. When you're truly aware.
One test failure has little bearing on real-world success. Do you know the percentage of successful persons who struggled in school? They're all of them. It's typical. But what's this? The key is that those folks who were successful didn't give up. They persisted in making efforts to improve THEMSELVES. In everything they do, they are better. No one wants the man who aced every exam when you're out in the real world; they want the guy who was willing to fight for what he believed in and had the will to keep going after failure. That person is far more important than someone who only knows what they read in a book.