Question: what is the best way to study in university if you are a C student ?? 

Answer: Get a study partner, someone with whom you're comfortable that usually makes better grades - try to adopt any strategies they use that you're comfortable with.  Also, make use of the office hours offered by your professors.  They not only can clear things up for you, but may give you helpful hints on what or how to study, and if your grade is right on the line showing interest can only help your cause.
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