How many directors were there for the film Course Completed?
CREATE TABLE "table1_10798928_1" (
  "year_ceremony" text,
  "film_title_used_in_nomination" text,
  "original_title" text,
  "director" text,
  "result" text
);
SELECT COUNT("director") FROM "table1_10798928_1" WHERE "film_title_used_in_nomination"='Course Completed';