Re: First week of training in new class.
What school are you training at? Who is the instructor?
Also, don't worry about learning something new. So what if you learn a different way to do an armbar? You think there is only one way? Not so. Many many variables from each position. You will never learn them all.
But remember to empty your cup. Not, your jock strap, but your thought process. As long as you keep your cup full, you will not learn (or re-fill your cup) anything new.