First of all if you want to be a brainly star you can contact  moderator

But there are some other rules too:

★ Your answers should be elaborated and explained

★ You should behave well and politely with all the members of brainly

★ You have to avoid spamming

And lastly,

★ Obey the rules of the leaders

If you can follow these rules, you can surely be a 'good' brainly star!