Put forward four mathematical models of learning efficiency: exam review model, talent cultivation model, career development model and quality education model. Exam review model points out those students of common capacity and quality are likely to get higher score. Talent cultivation model points out that the students very talented in some respects may not get ideal exam result. Career development model gives two elements which decide a personal career achievement: learning rate and learning time. Quality education model describes the expectation of future talent types, and provides a tentative idea of quality education.