Sato Publishing Contains 15 lessons. Discounts are not available for abacus materials. When combined orders save on shipping, the price may be reduced accordingly, but it will not be below the list price due to copyright law. Shipping will be via anonymous delivery, using the "Nekopos" service. Before applying for the certification exam, write the answers to the problem sets in a notebook. Once you have applied for the exam, practicing with the print collection is effective. Print collections are also available. If you are not good at mental addition, check out the mental addition hospital below: #Soronyan Abacus Materials ← You can see all the abacus materials here. Please read the profile carefully❗️carefully❗️carefully❗️ and purchase without commenting if you have no questions or combined order requests. Right brain activation Dementia prevention Preventing cognitive decline Concentration Perseverance Self-study Home study