First things first, congratulations on becoming a member of the 72 club! This is a massive achievement! The 144 club is an optional extra challenge, by no means a requirement. Have fun challenging yourself and seeing your scores improve week on week.
The rules are just the same as the 72 club but the aim is to recall your multiplication facts faster so you can do more and more questions in the same 7 minutes! Once again, you don't have to do the tests in a particular order, they just have numbers so you can match up the correct questions and answers.