Anxiety is a cause of procrastination. You feel your upcoming work will be difficult, so you find a way to distract yourself.

Sometimes your anxiety stems from the standard you expect from yourself. You need to do a practice test, but you don't feel you've mastered the material. You want to write an essay but have no ideas. A good response is to simply lower your standards for now. Be okay with writing a draft you'll throw away just to get the ideas out. A good first step is just to show up, reminding yourself that giving yourself space to focus is more important than an arbitrary standard.