1. Being an apprentice is very tiring. There are many things for you to do in the shop. How can you have time to learn products?
2, there is no material for you to practice, the raw materials purchased by the cake shop are certain, how can there be extra for you to practice.
Without the guidance of professional teachers, no matter how busy the boss is, he won't have time to teach you products.
So I suggest you go to a professional West Point school to study.