Mastery Schools | 15,706 followers on LinkedIn. Love your work. Build your career. #ChooseMastery | Mastery Charter Schools and Mastery Schools of Camden form a non-profit school network of charter, turnaround and renaissance schools in Philadelphia, PA and Camden, NJ, serving over 14,000 students in grades K-12. Our mission is to ensure all students learn the academic and personal skills they need to be truly prepared for postsecondary success and able to pursue their dreams. Mastery is nationally recognized for its ability to turn around failing neighborhood schools and to drive dramatic student achievement gains.