Mathematics cannot be learned by watching someone else (teacher, tutor, peer) do it -- you need to do it yourself. Relate to trying to help a friend who has a serious problem: a text message :( vs. meeting your friend face to face.
Be responsible for your learning. It is too easy to "validate" your poor math test mark on the fact that you, and a few of your peers, agree that the "test was too difficult" or that the "teacher did not give enough examples to practice."
You studied hard and failed a math test. What do you do? How you deal with failure is a major key to success!
You work on a math problem and you cannot get the answer. When do you give up? Relate to persistence, grit.
Math makes you think and discover truly interesting things, You realize that it's very little about talent, and a whole lot more about working hard. Don't lead a shallow life, reflect often on people and things that surround you. Whatever you truly care for (parents, friends, sports, hobbies) requires your energy, dedication and lots of time.
Do not waste your time. Reference to the 10,000 hours myth (and how, by age of 15 or 16, some kids spend that much time playing video games). Imagine where you would be if you spent 10,000 hours doing math!