No one in the controlling community has gotten to where they are without the help of someone. It’s important that when you get to where you need to get, whether that be a passed test or see an improvement, you thank those who helped you get to where you are.
Don’t forget anyone. It’s part of the transaction. Someone helps, then you pay in a simple thank you at the end. It seems simple but it let’s the person helping you know that you appreciated their help which will go a long way.