WafaaIssa

You can do pretty much anything that is not illegal while you are AOS, but I would not do it. In case your AOS is denied you need to bounce back to your status, and studying would be a violation to your B1 terms. 

You can do it, but it's considered a violation of the terms of your B visa. Because you've already filed the I-485, the violation will not count against you on this application, but if for some reason you don't get approved and you find yourself applying for a new visa in the future, you have to disclose this violation on the application forms.