How to concentrate while studying?

Some techniques for you:
Turn of all distracting noise.
Set a timer, study for 20-30 minute intervals, then get up and move around for 5 minutes.
Avoid eating while studying.
"Reward yourself" after reaching goals.
Make notes or flashcards emphasizing important points.

Remove distractions. Find a clean, quiet space AWAY from computers, ipods, videogames and other distractions. Develop good study habits by starting your work at the same time every day, budgeting your time, and scheduling small breaks. Use your breaks to get up and stretch, have a light snack, etc.
Go to bed at a reasonable hour and get plenty of sleep so you won't be too tired when you are studying.