Heewon, all of the majors at Yale are well-known and very respected among employers, graduate schools, professional schools, etc. The most popular majors are history, economics, psychology, and english. Molecular, Cellular, and Developmental biology is popular among science majors. The curriculum at Yale is very challenging. If you want to know more about courses at Yale check out
Yale Online Course Information | Search Courses. Also Yale College (which is what Yale mostly refers to) is historically known for being the one of the best universities in the country and arguably in the world for the humanities. The science curriculum though is very strong and billions is being invested in research, etc. IvyLeague294, improvement is always a good thing although keep in mind that one test is not going to change Yale's decision. I am convinced they view all of their candidate holistically. That is the ENTIRE package counts. But a 770 is great, good job!