Meditation can help improve concentration by relaxing both the body and mind. Simple breathing meditation techniques instruct practitioners to sit comfortably, breathe slowly through the nose, and focus on either their breathing or nothing at all. Regular meditation of 5 minutes initially, gradually increasing to 25-30 minutes per session, trains the mind and helps it focus more easily. The restless nature of human attention makes concentration difficult, but meditation provides a means to overcome this and enhance focus.

1. how to improve concentration
http://www.artofliving.org/in-en/meditation/meditation-for-you/meditation-for-concentration

2. Does meditation improve attention?
The problem with attention is that it naturally likes to
jump around from one thing to another: attention is
antsy, it won’t settle — this is not in itself a bad thing,
just the way it is. Attention’s fidgety nature can be
clearly seen in the phenomenon of ‘binocular rivalry’.
http://www.artofliving.org/in-en/meditation/meditation-for-you/meditation-for-concentration

3. Beginner’s guide to meditation
● Relax the body and the mind
http://www.artofliving.org/in-en/meditation/meditation-for-you/meditation-for-concentration
● Be mindful
● Concentrate on something.
● Concentrate on nothing.

4. We all know how
important it is to
have the ability to
focus. It's crucial for
just about every
activity we engage
in, but sometimes
we lose it just when
it's needed most.
http://www.artofliving.org/in-en/meditation/meditation-for-you/meditation-for-concentration

5. Simple Breathing
Meditation:
First you should find yourself
a quiet place .Keep your
back straight but not
rigid.Begin to slowly inhale
and exhale through your
nose.Continue this practice
for 5 minutes. Over time
gradually lengthen your
mediation period so that you
eventually are meditating for
25 – 30 minutes in each
session.
http://www.artofliving.org/in-en/meditation/meditation-for-you/meditation-for-concentration

6. Read more to
Improve concentration
http://www.artofliving.org/in-en/meditation/meditation-for-you/meditation-for-concentration