That sentence sounds somewhat confusing because you really can't study credits. I think this sounds better: Students can study for 18 credits worth of courses each semester. You can replace each with every, it doesn't change the meaning of the sentence.
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AnonymousThat sentence sounds somewhat confusing because you really can't study credits.Right, Anon. But I would go further
I think this sounds better:
Students can study for 18 credits worth of courses each semester.
You can replace each with every, it doesn't change the meaning of the sentence.