It's good to strengthen Tang Jiafeng's five sets of volumes. It is mainly used for review materials in the intensive stage of postgraduate entrance examination, which is very beneficial to the majority of postgraduate entrance examination. It takes about two and a half hours for Tang Jiafeng to strengthen five sets of papers, and the calculation is still very online. Tang Jiafeng, born in 1966, a native of Dongtai City, Jiangsu Province, has more than 20 years of experience in postgraduate counseling. From undergraduate, master to doctor, he is also a teacher of mathematics. Teacher Tang Jiafeng graduated from the famous Nanjing University with a master's degree from South China Normal University and a doctor's degree in mathematics from Nanjing University. After graduation, I worked in Nanjing University of Technology and was promoted to associate professor. Every year, the students he trains take many math tests.