Hello docstep1, you are asking a complicated question. Depending on whether you should postpone your exam(s) depends on several factors as with any major exam:
What score do you want?
What score do you need?
How long were you studying beforehand?
How are things going to change if you postpone? Is 1 week really going to make a difference? I would say no especially regarding the step.
If you do postpone would this conflict with your classes?
Would you be able to study as much as you need to? Keep in mind that even if you continue to study but have to manage additional responsibilities then you might actually end up scoring less.
When would you schedule the exam?
These are questions only you can answer and if you have an educational counselor to talk to it might be worth bringing these points up.
freecitizen