If you're clear about your career goals, you can determine whether earning the highest grade in class is worth the stress.
Balance is key.
Your classmates constitute one of the most dynamic, accomplished groups of people you may ever meet. Getting to know them over the two years will likely contribute as much, if not more, to your long-term success than memorizing random factoids. Everything works out in the wash. Don't forget to enjoy yourself while learning. In An acquaintance once calculated that he spent about 55 hours a week outside of class on academics.