Donors' contributions to a 501(c)(3) organization are tax-deductible only if the contribution is for the use of the 501(c)(3) organization, and that the 501(c)(3) organization is not merely serving as an agent or conduit of a foreign charitable organization.
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.
Pass-rates for each section have hovered around 43% in a given year, making the CFA one of the most grueling tests you're likely to face. (For more, see: Pass Your CFA Exams on the First Try.) In fact, the general consensus is that the CFA exam is harder to pass, and requires more study, than the CPA exam. And that exam is hardly a cake-walk.