I usually buy the standard items such as pens, pencils etc before the year begins. I definitely would not buy the calculator until you find out exactly what you need. My child insists on color coded items per subject so she can just grab the notebook, folder and book fast as they have three minutes to change classes. For example she grabs the green binder, notebook and textbook for her Chemistry class. I wouldn't even buy the notebooks yet because some teachers specifically want 3 or 5 subject ones. Its fun to buy some locker magnets and mirror before the year starts to personalize the locker.