###Human: I lack concentration in my studies. Kindly help. ###Assistant: Hello. Is there any precipitating cause for such problem like loss of money, relationship problem, family issue. Have you started Modalert before your concentration problem have arisen? It is an activator type of drug but create an anxious feeling and can decrease concentration. What about your current pattern of sleep? So the management plan will be like, 1. Remove any causative problem if present. 2. If your problem is without any cause, then it might be performance anxiety. It may need treatment for the short term. 3. Yoga, moderate exercise, meditation can help you. 4. Psychotherapy.