There are 6 levels of ASL when you learn.
As you learn each level, your expertise changes. The instructor will encourage you to do much more socialising ie silent dinners, socialising with the Deaf Community and will grade you when he/she appears at those socials.
The instructor may recruit his/her friends to grade you as well. There are different approaches to different instructors but they all share one same perspective, learn ASL and Deaf Culture.