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Expect ~$1,000 USD per exam for the exam fees and the CFA Institute books. Most people will also use a third-party self-study packages, which include practice exams, condensed books (the CFA ones are 2x+ longer), study tips, online question banks, etc. Factor in an additional $500-1,000 USD per exam for these. Schweser is the most popular study package: http://www.schweser.com/cfa/. No matter how diligent you think you are, most people I know took an additional 5-10 days holiday in the run-up to the exam.
Further, it is a mathematical probability that you will most likely fail to pass one level. Pass rates for each exam average less than 50%. On average it takes four years to pass all three levels of the CFA program, which is likely as long as it took to earn your bachelor's degree.In short, the best part about the CFA program is when you finish.assing the exams is no walk in the park either. The exam material is written such that it takes about 300 hours of studying over six months per level to pass. Believe me, that's a lot of time given the CFA is a self-study course taken while you are still working full-time or in business school.