Advanced Math and Science Academy Charter School (AMSACS) is a charter school founded in 2005. It is located at 201 Forest Street in Marlborough, Massachusetts, U.S., in a few remodeled office buildings. The school is widely recognized for its academic achievements, consistently scoring in the highest percentile among Massachusetts schools in the English, math and science MCAS exams. In 2015, U.S. News & World Report ranked the school the #4 high school in Massachusetts.