"i am a 19 year old studying chemical engineering in college, and i would say that concerta has helped me so much. i started taking this in 18mg doses in 3rd grade and i was then able make straight a&#039;s through 5th grade. i then began taking a higher dosage of 36mg in middle school and continued taking it until this day.  i graduated within the top 4% of my high school class and i am doing very well in college.  the single greatest thing about concerta at 36mg dosage, is that i can study and stay focused up to 12 hours straight! i have become an extremely hard worker and other students, who don&#039;t have add, simply can&#039;t keep up with me because of the amount of time i am able to put into my studies.  i would highly recommend concerta."