If you want to go pararescue how should you do it?

You never want to join the military into a job that requires a selection process like Pararescue (PJ), Special Forces, Ranger, or Combat Air Controller. Your chances of successful making it through selection are a smidgeon above zero. The selection rate for the PJ selection is about 10-20%, and that includes the in-service recruits who've been training a year or two for it.

Then there are still more people who fail somewhere in the pipeline as well, whether for injury admin, behavioral, family, or academic reasons. Many of these pipelines are about a year long after the selection, that's a long time to go at high speed, beating up your body every day.

The point is that when you fail the training you contracted for as an initial entry service person, the service you joined will retrain you into whatever job they choose so you can finish out your contract. Now if you don't mind being a mechanic on the flight line, or the person handing out towels at the gym (that's a job in the Air Force), then it's not an issue for you.

Compare that to in service recruits. You join the military, you get your job, you train up with some knowledgeable people who have gone, or have friends who have attended the course. Longer training time means you're already more prepared than the people coming out of basic. If you fail, you return to your old job. Most selections will allow you to attend twice, so you can go back and train harder.

For Pararescue, you need to get in the pool for hours at a time, stay in the pool the whole time, and get used to not breathing. Water polo players always seem to be especially good at handling combat dive school

SFC (Join to see) provides excellent advice. Recommend you enlist for an AFSC related to some of the work you might do as a PJ. This depends on your scores, of course. I would recommend aircraft mechanic, life support equipment technician, medic, intelligence analyst, mission command technician. Get the AFSC choice in writing from recruiter. Volunteer for PJ duty after you complete basic and tech school.

Basic was a long time ago, but in 1992 PJs would visit Basic flights and provide the opportunity for enlistees to try out then.