Just like you have to take a lot of practice certificates when you are working, but that certificate is just a stepping stone, sometimes it is not even a stepping stone. He is just a temporary representative. In practical work, what others value more is your ability, which is what you have learned and put into use, so the real strength is accumulated over time. If you don't think you did well in the exam this afternoon, what you really need to do is review tomorrow's exam. Don't be discouraged, just like an ordinary exam, believe me.