How hard are the requeriments on your Kung Fu Programm ?

I want to ask to instructors and students about how many forms do you think is immportant an student need to memorize before he can star to learn new forms?

In large styles like Northern Shaolin or Praying Mantis with a large number of forms and weapons how do you work ? Do you teach 10 forms and push your students to memorize all them or do you only focus on the forms your student is learning right now and you don't push him to keep and memorize the previous forms learning years ago ?


thank you