Aditya Shukla, Psychologist, Cognition Today
Fragrances have an anti-anxiety effect. You can use fragrant body washes and perfumes to stay calm during an exam.
Although they seem superstitious, the mind tends to believe in stories even if they aren't real. Having an object that makes you feel good because of its history/story can prevent test anxiety.
"Biophilia" the name given to our inner tendency to connect to nature can reduce anxiety and stress. Nature calms us. Clothes that trigger "nature" feelings can help indirectly.
Thinking you are "batman" or any other superhero with intelligence, can make you adopt that hero's characteristics and improve your cognitive performance.
An erect posture, while sitting or standing, has shown to be improve mood, increase confidence, and also improve alertness.
System 1 thinking is based on feelings and quick judgments. If you have studied a lot, go with your gut feeling because your system 1 thinking will mostly point you toward things you already know by heart. In this case, system 2 thinking is slow and deliberate - sometimes, overthinking.
Stretching helps to reduce the tension in the body. An anxious mind doesn't stay anxious in a relaxed body, especially if the body is forced to relax.