Planning is necessary before doing something, doesn't matter it's an exam or a trip, to avoid stress.
Making yourself a priority is necessary for self-care or self-love. Thinking about yourself is essential to avoid your tensions.
Most of the stress and tensions are related to finance, and saving your funds and maintaining backup funds for yourself is better.
Don't be afraid to say No. Always saying yes also makes you stressed. If you don't want to do something, say No.