I have already taught his school book math.and now I am teaching him 6 table now.i have a fear that kid will forget past topics How will I teach

A. Whenever you teaching something new to the child you have to make sure that the past teaching that has been there you just have to keep repeating it so start with what you’ve thought in the path then go to the topic now that you want to do tables and all so slowly the child will also remember what you’ve thought in the past