Question: Please check the parenthesis part!? During the first few weeks of class he is asked to participate in a variety of activities, each of which (takes away from) his studey time.\nWhat I want to know is that ,in the parenthesis part, the preposition -from- is right in the sentence. I think that should be removed.

Answer: There needs to be something other than just "takes away", because "takes away his study time" would imply each activity took all of it.  "Takes away from" is fine.  It would also be correct to say "takes away some of", "infringes on", "chips away at", or just "reduces".
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