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If you feel like you're not understanding the material in your classes, don't be afraid to ask your professors or peers for help. The resources vary by college, so find out early how you can get help. Some people like to do schoolwork in the tutor center. It's a quiet place, and then if you need help, you can ask for it. Ask your classmates if they want to study. It can make studying more fun, and you can learn a lot. Grades are not the only measure of your skill as a student, and if they're not good, you often still have time to improve them. Focus on getting good grades, not perfect grades, and doing the best you can. If you did your best, that's a victory and you can feel proud. If you're worried about your grade, try going to office hours and asking your professor for help. Professors like students who take initiative and show up to office hours. It helps to review your notes after each class, and ask questions if you have them. Then start studying for tests early, so that there is no rush. Try starting your studying a week before the actual exam. Never pull an all-nighter. Even if you manage to stay awake during the exam, your memory will be impaired due to sleep deprivation. Students who pull all-nighters get worse grades, and students who get enough sleep before an exam get better scores. Buy new clothes, eat a hearty meal, go out with friends, or take a long break to watch your favorite show and relax. Good effort is worth celebrating. You don't want to be surprised when you get midterm or final grades. Instead, check your grades periodically so that you'll notice if something looks wrong or bad. You can talk to your professor if you're struggling. Professors like students who show up to office hours. Feel free to go there to ask questions or ask for help. They are typically quite knowledgeable about research. Expert librarians have a degree in library science, and have done research and published papers. Library science is more than organizing books. Librarians learn a little bit about all kinds of different subjects, enough so that they can usually understand the basics of your project and point you to what you need. Only consider buying them if you think you will find the useful in the future. Also consider buying their e-book version, if available, to save money. Avoid buying from the school store, if you can. Online retailers like Amazon are usually cheaper.
Get tutoring as needed or desired. Try forming small study groups. Avoid over-stressing about grades. Start studying early, so you don't have to cram. Treat yourself after working hard for an exam or project. Keep an eye on your grades. Talk to librarians for research projects. Borrow books first before buying.