What are some of the hardest things to get done on your to-do lists?

I realized that I tend to procrastinate on the tasks that are more important than others, or tasks that mean a lot for me. If my daily tasks are: clean my room, study for an exam, prepare dinner, the harder task to get done will be “study for an exam”, because I’m aware that I’m gonna have an exam, and this cause me performance anxiety.
Other things that I find difficult to accomplish are, obviously, the ones I liked the least, because I have a tendency to laziness.