You usually use "学士” for bachelors, "修士" for masters, and "博士" for doctors in Japan. The first one is not so frequently used as the others are, though. You more often just say "大卒", while you usually say "院卒" for masters and doctors. Here in this sentence, "院" means graduate school and "卒" means graduation. "院卒" means people who finished graduate school.