How to achieve good level of concentration?

I have very very weak concentration, whenever i listen or do any work there is something going on in my mind and i 95% involved in my own unnecessary and useless, meaningless thouts due to this i cant listen to the speaker and i commit to much mistake in my work, i m unable to remember things, phone numbers and... show more I have very very weak concentration, whenever i listen or do any work there is something going on in my mind and i 95% involved in my own unnecessary and useless, meaningless thouts due to this i cant listen to the speaker and i commit to much mistake in my work, i m unable to remember things, phone numbers and sometime i forget to do very very important work due to the habit of my unnecesary meaningless thinking, so finally i have not concentration, how can i achieve and maintain it for long time in my life , kindly suggest.
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