Since you requested for Premium Processing, there is a chance that all could be adjudicated together. Once the H-4 gets extended, automatic...

Although you may file Motion to Reopen, refiling of I-485 could be an option.

I am assuming you timely filed I-539 to change status from H-1B to B-1 (should have been B-2). Assuming so, although better to file I-539 to...

You should be able to travel back to the United States by automatic visa revalidation, unless you have any other issues to prevent you from so doing.

I do not see any issue for you to travel out of the United States and return to the Untied States, unless you are aware of any issue that may...

1. It is possible for H-1B Change of Employer and/or Concurrent Employment. 2. See No. 1.

With pending AOS, you may attend school. You might also want to check with your school how they want you to pay your tuition.

OPT and STEM OPT are considered to be "maintained" as long as you maintain your employment with the employer authorized under I-20. If, for...

The answer depends on the meaning of "F-1 refused."

You will be probably questioned, too, about what you will do after the OPT (STEM OPT) expires. I suggest you consult with an immigration attorney...