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You should never go to class on an empty stomach. Hunger pangs can easily distract you from the curriculum. Always have something to eat before a class. In a morning class especially, make sure to get up in time for breakfast. If you don't have time for a big meal, grab something small. A piece of toast or a bowl of yogurt can really help you focus during class. Prior to class, make a list of reasons you sometimes have trouble concentrating. This can include things like checking your phone, a noisy classroom, and a tendency to daydream. Then, write down ways you can combat these problems.  For example, you can write down something like, "I can't resist the temptation to check my phone when I hear it buzz in my pocket." Think of a way to eliminate this distraction. For example, "I should turn my phone off before class." Unless a laptop is required for class, leave yours behind. You'll be able to focus more when you take notes by hand as you're less likely to be distracted by a lingering internet browser.  Install a program on your computer to block out your favorite social media sites during the specific times you’re in class or open a new window so you aren’t distracted. It's okay to bring your phone, as you may need it for directions immediately after class. However, be sure to power it down before class begins. Exercise can help you focus. If you have time, get a workout in before class in the morning. If you don't have time for a full workout, some light exercise can help. Go for a short walk before class or do some light cardio in your apartment. If you typically drive to class, try walking or biking instead. This will allow you to get in a brief workout on your way to class.
Eat something before class. Think of common distractions and how to avoid them. Leave distracting technology behind. Do some light exercise.