Studying with particular crystals or wearing them as an amulet during exam time can help to focus the mind and bolster self belief. Quartz and Amethyst are used to alleviate confusion and aid relaxation. Hematite and Black Tourmaline protect us from fear and help with retaining information. Tiger's Eye helps with morale and self assurance as well as focus. Whilst the go-to crystal for good luck is Green Aventurine.