The document provides tips for improving concentration by controlling internal and external distractions. It recommends shutting off electronics to avoid external distractions from the environment. For internal distractions, it suggests eating healthy snacks to prevent hunger, doing light exercise to avoid drowsiness, finding ways to stay interested in boring material, asking for help with difficult topics, and writing down intrusive thoughts to refocus attention. The key message is that students have control over their concentration by addressing common causes of distraction.