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You will need to study to gain enough knowledge to pass your tests. There are study guides out there for people training to get their private pilot's license, which is a good way to start. But you should make sure to ask your instructor for good resources. Your instructor has experience getting people through their training and testing, and may know the best and latest resources out there to help. In addition to practicing flight procedures in your lessons, it's a good idea to study them on your own time. Different people have different ways of learning, and many people benefit from having information presented in several different ways. Reading about what you have been learning in your lessons will reinforce the knowledge so that you will have a better chance of remembering the skills and information. To get your private pilot's license, you have to pass not only a flying test-run, but also a knowledge test. The knowledge test includes a written and oral exam that will test your aeronautical knowledge. Some areas of study you will need to explore are aerodynamics, aircraft systems, aeronautical decision making, how to read weather forecasts and reports, and planning for the unexpected during flights. If you are having a hard time learning all of your "ground knowledge" at home, or are confused about what to study, consider enrolling in a class taught by a flight instructor. This class will be specially formulated for providing the information you need to know to safely fly and also to pass the written test.
Ask your flight instructor for resources. Study flight procedures. Study aeronautics. Take classes.