Hello, Which model will you use in the exam ? Chain or Algebraic Operating System ? Those modes are available in your BA TI calculator (2nd format). I’ve detected some issues while calculating some examples in the 3rd party notes (elan guides), in example: You can read this in a problem, if you use the default mode (chn) and type de operation you get a wrong result: 3410+270 x (1-0.3) = 3599 (correct answer) 3410+270 x (1-0.3) = 2576 (wrong result using CHN mode) 3410+270 x (1-0.3) = 3599 (correct result using AOS mode) 3410+(270 x (1-0.3)) = 3599 (correct answer CHN mode) As you see, in the CHN mode the suggested operation 3410+270 x (1-0.3) requires an extra parenthesis. The CHN is used by financial calculators and AOS is used by the scientific calculators that many people uses. As you can read in the calculator manual page 5. 3+2x4= 11 using AOS 3+2x4= 20 using CHN You see that the operation “x” doesn’t have priority as it should, like in the AOS mode. To get the same result you should use 3+(2x4) in CHN. In the 3rd party notes they assume that you use the default CHN mode of your calculator (afaik) but they don’t explicitly uses the extra parenthesis needed 3410+[270 x (1-0.3)] to get the result they show in their calculations. This can confuse a lot of people, and in the exam can cause some problems. Imagine an exam question with this answers for the operation 3410+270 x (1-0.3): a) 2576.00 b) 3599 c) 3597 d) 2576.10 Many people can do the operation fast without an extra parenthesis with a BA II TI calculator and choose answer A. Because the result matches. But the correct answer is not A, it’s B. You can get both results in your calculator and both appears in the answers. Did you noticed that ? Providers of CFA material should correct the examples they use or mention which method on your calculator it is supposed to be set. IMHO . Also, how many decimal values do you use ? default is 2 iir, thing is the calculator stores the value with precision but shows it rounded. This sometimes is confusing, if you always used a scientific Casio® calculator.