Successful students have good study habits. They apply these habits to all of their classes.
Plan specific times for studying
Study time is any time you are doing something related to schoolwork. It can be completing assigned reading, working on a paper or project, or studying for a test. Schedule specific times throughout the week for your study time.
Manage your time
Make a weekly schedule and devote a certain amount of time per day to studying. This will also improve your grades. That amount will vary depending on whether you are in high school or college, and also varies by field of study.
Study for 20 minutes at a time, and then take a 10 minute break so that the information sinks in. This is a tried and true learning method. When you are feeling overwhelmed, take a break, let the stuff you just learned sink in, and come back to it. Repetition is the key to studying well.
When you are trying to study or working on a project for long periods of time, you don't need to eat a five course meal, but don't starve yourself either. Try to eat foods that are considered clean or at least somewhat clean.
Get enough sleep at night
It's harder to concentrate when you got less than six hours of sleep the night before. Aim for eight to ten hours of deep sleep to feel truly refreshed and ready for anything in the morning.