To stop procrastinating on your studying or schoolwork right now, you should identify the smallest possible thing you can do to make progress on it, and then modify your environment to make it as likely as possible that you will do it.
For example, if you need to study for an exam, the smallest possible step that you can take toward doing this might be to open your notes and go over just the first paragraph that you have written down. Once you realize that this is all you need to do, you can start modifying your study environment to help yourself achieve this, for example by going to a room with no distractions and leaving your phone outside.
There are many other anti-procrastination techniques you can use as a student. Start by trying a few of them that seem relevant based on factors like your circumstances and the specific causes of your procrastination. Over time, you can modify which techniques you use and how you use them, based on how they work for you.
Improve your planning:
Set concrete goals for yourself. For example, instead of a vague goal, such as “study for my upcoming exam”, set a concrete goal, such as “on the week of my upcoming exam, go to the library every day after I finish my last class for the day, and spend at least 2 hours studying”.
Break your tasks into small and manageable steps. For example, if you need to write an essay, you can start with steps such as figuring out the title, creating a rough outline, and finding five appropriate academic sources. Note that if the project in question is large, then you generally shouldn’t worry about figuring out all the steps to it from the start. Instead, start by identifying only the first few steps that you need to take, and then identify new steps as you make progress, to avoid feeling overwhelmed or getting stuck.
Set intermediate milestones and deadlines for yourself. If your instructor hasn’t done this already, or if they’ve only set a single major deadline at the end, setting scaffolded intermediate milestones and deadlines for yourself will help you plan ahead, be accountable, and feel more motivated to make continuous progress.