Is there an over-the-counter product that can help improve concentration?

There are no over-the-counter products that have been proven to improve concentration. Some studies suggest that Omega-3 supplements may help, but the evidence is not conclusive. To improve your concentration while studying, try to minimize distractions like your phone, computer, TV, and noise. Make a list of study goals to track your progress and stay focused. Take short breaks frequently, like every hour. Exercise and getting enough sleep can also help you relax and retain the material you are studying. Good luck with your exams!