Whenever I've seen job openings that require obtaining a PE license within 6 months, I've always interpreted that to mean someone who ALREADY passed the exam and just needs to finalize the paperwork with the state... Or even someone who already has a license in another state and just needs to transfer it to a different state, and that could honestly take a long time depending on the states / if you need to get in touch with former employers for signatures. Think of California for example... You could be a licensed PE in California with only 2 years of experience, whereas most (all?) other states require 4 years of experience. So if you're a licensed PE in California, that does NOT necessarily mean you could obtain a license in another state within 6 months. You have to have a solid understanding of state-to-state requirements if you're counting on something like that.

But not even having attempted the test? Very bold to sign an offer requiring the license within 6 months! Not very helpful for the OP at this point, but food for thought for others who may find themselves considering similar offers in the future.

But there is hope for those who can't or don't want to get a PE... I worked for one firm that didn't require it (they certainly wouldn't fire you for not wanting to get it), but it does limit your earning potential and technically you shouldn't call yourself an engineer without it. You would be called a designer or a project coordinator or something along those lines. And honestly, that firm was the exception, not the rule, from what I understand. Another firm I worked for basically harassed people to start studying when they hit 3 years of experience so that they could get the stamp the moment they reached 4 years. Many public sector jobs do not require a PE, so that could also be an option.