Studying is a different beast. If you wait last minute to study for a big test (especially if it is a subject you’re not that good at) it will more likely than not lead to a poor score. You don’t have to spend 8 hours a day studying right up until the exam, but a full week or couple days before the test try studying at least an hour - in small doses, things will seem less daunting and it may even help you remember the things you need to learn.
Projects are the same thing, in my opinion, try to start it piece by piece or else you will just try to be rushing the day before. One last important thing to remember as well, never overwork and stress yourself out. It’s important to take breaks or else your work will get sloppy. Finals are important but they are not life or death. Your mental health and overall well-being should always come first. Have a good week and good luck!!