How can II improve my concentration on one thing e.G. Studies?

ADHD!!!! Is there a possibility that this could be adhd. Having adhd does not means that you need to be jumpin off the wall. People that have the innatention type will only have problem focusing and concentrating. If this is adhd then amphetamine is your answer.
L-Glutamine daily. Taking l-glutamine supplement along with nac will clear mental fog.