The human brain can concentrate for 45 minutes at a stretch. Take breaks every 45 minutes to retain better. Durung breaks spend time walking outside in the garden or otherwise, listen to some soothing music, go for a run in the park, soak in the sun for 10 minutes to take in vitamin D. Do not sit in front of the tv or computers or phones. The idea is to relax the eyes and mind. Youtudies. can use these easy tips for any thing you do , be it at work or studies.