CHST Exam prep

I’ve been working on getting in the safety field for years. I got my OSHA 510 and my OSHA 500. Once I obtained those I got a job as a SSHO with a GC on base. After my one year review they informed me that I was performing my work at a very high level and they wanted me to pursue getting my CHST so that I could be looked at for a promotion to Lead Safety manager for bigger projects. I’ve taken the bcsp practice tests and I even got the no metric study guide, but I am still nervous about taking the test especially with how expensive it is. Any tips or suggestions? Maybe I am overthinking it but I don’t want to find out when I sit down to take it.