Each has its own advantages and is more suitable for primary school students.

"A Book" is a secondary school supplementary book published by Tianjin People's Publishing House and edited by Zhang Liansheng.

"Dian Dian Dian" is a well-known teaching assistant edited by Rong and published by Longmen Bookstore in May 20 12. The book contains special final training papers and scientific division modules, which conform to the rules of final review and examination and help students systematically integrate knowledge and review.