I must agree with people who said khat also helps. Once, I chewed before and while in the class taking the exam and wallahi I was like this is so easy. Let's put this, the Professor was like, are you sure you are done with that exam. Apparently, I was done within 45 minutes of the 3 hour time exam.
Things were so clear and my memory for all the equation were like if I had the book open in front of me.
About 7 months ago, a colleague of mine was taking the final (3rd) CFA exam and I gave him some. He turned that into juice and drunk before he sat for the exam. He scored almost perfect (at least that is what he told me).
