BOSTON (AP) — Minority students at three prestigious law schools say they want to delay final exams because they’ve been busy protesting grand jury decisions in the deaths of unarmed black men at the hands of white police officers in New York City and Ferguson, Missouri, and haven’t had time to study.Student groups at Harvard Law School, Georgetown University Law Center and Columbia Law School say demonstrations and rallies over the Eric Garner and Michael Brown cases have prevented many students from adequately preparing for exams.Cities across the country have seen large-scale demonstrations since grand juries in both cases recently decided not to indict the police officers in the men’s deaths. A medical examiner says Garner, who had asthma, died after being placed in a chokehold by an officer on Staten Island. Brown was shot by an officer in a St. Louis suburb.At Harvard Law School, a coalition of student groups representing Asian, black, Native American and other minority students says many students have been compelled to take action because the “national tragedy” implicated a judicial system they had chosen to join by studying law.