STEP is an additional admission test for high school students who want to read mathematics in University of Cambridge. It is more technical than A-level mathematics and hence it requires extra training. My goal here is to help aspiring young mathematicians like me (several years ago) get S (highest grade in STEP) in all three STEP papers (STEP1, 2 and 3), thereby being not only prepared but also competitive for the best mathematical education in the best universities. Besides, I will also introduce some concepts about mathematics that we learn in universities to enrich knowledge and provide a prospect of studying mathematics further. Finally, I wish every success for my students and cannot wait to meet and become friends with you.