I don't know exactly what it is that you're looking for (you were a little vague), but if you need help with studying or memorization for exams rosemary is said to be helpful with that.
Rosemary tea is thought to improve memory. Students have been known to carry it with then in their pocket to help with memory when taking exams. You could also burn the incense while studying or even carry a small sachet filled with the herb with you on exam days.
Be careful if you decide to drink rosemary tea, however. When ingested, Rosemary can irritate the lining of the stomach, the intestines, and the kidneys. Therefore, use it in small amounts (one cup of tea if using the tea) and don't take it daily unless suggested by your physician.
Below are a few good sites if you want t read further on the herb.