I hate to say it Xray but boot camp is a lot more stressful than taking a required knowledge test your recruiter made up. Just think of it as a prerequisite for getting the job. If you don't meet the requirements, you don't get the job. Your one job is to exceed the PT requirements and know all of the required knowledge. If you're out of high school, you have nothing but time.
Also, if your recruiter said you have to do it, then it is accurate. He doesn't have to send you if he doesn't think you're prepared. You can do it. Get your learn on...and when you're taking a break from learning, go out for a job or do some push ups and sit ups.