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Yes, questions could be pointing to both 1-tail or 2-tail tests. So, it will be good to memorize standardized z values for both for mosty used confidence intervals. (90, 95 and 99)

But most common 1-tail z characteristic asked for is at 95% confidence, which is same as that for 2-tail at 90% confidence. (i.e. 1.65). And you will be expected to know it as they will not be providing its value in the question.

I dont remember having to use 1-tail value for 90% or 99% in CFA exam or in any practice questions though.

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