Difficulty: Little Pigeon Wan Wei series books are less difficult and suitable for students with weak foundation. Star Volume is a series of professional and difficult books, which is suitable for primary and junior high school students and can better connect the learning contents of primary and junior high schools.
Different functions: Pigeon Wan Wei series books can help students with weak foundation to improve their learning ability. The topic design of the starry sky volume is more professional, covering the knowledge points of various disciplines, which can comprehensively improve students' comprehensive quality.