Optimal English Grammar: The Most Efficient English Grammar Book
Paul S. Lee has devoted his life to the optimal ways of learning.  He is the creator and developer of OVAM (Optimal Vocabulary Accumulation Method) and OMM (Optimal Memorization Method) and, for more than 15 years, has been teaching all the sections of the SAT, ACT, TOEFL, GRE, GED, SSAT, math competition questions, Economics, Statistics, etc.  He got his B.A. in Economics and Psychology at the Johns Hopkins University.  At the University of Chicago Ph.D. program in Economics, he got his M.A. and completed all Ph.D. program requirements other than the dissertation.