Yes.
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navitasanCan't these sentences mean two things: a) You have to/must work hard and pass the exam. b) If you want to pass the exam, you have to/must work hard.I sense only meaning b). I don't sense that either 1) or 2) imply "You must pass the exam".
CalifJimI sense only meaning b). I don't sense that either 1) or 2) imply "You must pass the exam".The other meaning would be like "I must run to catch the train". I think that one probably can hardly have meaning (b), so it may be easier to visualise.