As long as you have skills, you can learn how to do it. I went to a vocational school and then took the college entrance examination. I also studied cooking in college for six years. You must take the exam step by step. It's hard.
Medium, low and advanced, three kinds. Now it's not as divided as before, one, two, three, four, one, two, three. Are collectively referred to as medium, low and advanced.
The lower level is the previous 3.4, the intermediate level is 1.2, and the advanced level is special 1.2.3. And the highest is the chef. Chefs should have more than 50 years of service and technical assessment.