Hlo doctor. Am rachna of 18 yrs. I was a gud student n hrdworker of my class. But these days I am unable to concentrate and focus. And totally scattered. I feel lazy n sleepy all d time. And am sleeping more. Actually I read an article about" smart drugs" are they really work. I have my vry imp exam this week medical entrance for wich I can do anything. I dnt understand wats happening wid me. Is there any quick solution or there exits any pills so as to keep concentration and stay focused long time. And to stay awakefull. Can I use concentration capsules jusz for a week. Are thre any side effects. Am using short trm na. I willnt be addicted for sure. If there r such capsules/pills. please suggest me. And its dosage. N also its guds n bads please Thnk a ton in advance.