Just think how important the subject (math) is, and what is its good effect if you give attention and importance on the subject (math), think of your ambitions, how can you reach this ambitions without learning the lesson? Do not be distracted with noisy classmates, don''t mind them but it's good to say it to your teacher assigned so that the person who distracts won't distract you, instead they will also listen and understand the current lesson in the subject, sometimes the problem is in you, not in your surroundings, if you are really determined to learn, you will never ever be distracted by anyone, nor anything (Except for some emergencies, etc.) . 
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