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Study mode is a great way to see all types of questions and get real time feedback for the questions you are answering.
Practice test is good for when you have done lots of “study mode” practice and want to see how you stack up on an actual test.
A good benchmark to practically ensure a passing great grade is 100% seen and ~80% aptitude in the “study mode” section, though this is by no means required and many have passed with much less studying than this.
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