Where do i put commas in the sentence?

Question

As anxiety from the ACT test builds anxious students ready with their pencils and calculators await instructions.

or are there supposed to be no commas?

Answer 1

As anxiety from the ACT test builds, anxious students, ready with their pencils and calculators, await instructions.

Answer 2

As anxiety from the ACT test builds, anxious students ready with their pencils and calculators, await instructions.  

Answer 3

Think of it this way, anywhere where, when you read the sentence and you have to stop to pause, there should be a comma placed.  

The CORRECT way should be:

As anxiety from the ACT test builds, anxious students, ready with their pencils and calculators, await instructions.