Failed CPO exam twice — what finally helped me pass on attempt three

I've been a pool operator for about six years but never bothered getting certified until my new employer made it a requirement. Figured it'd be easy since I already knew the job. Wrong. Failed the first attempt with a 68 (need 75 to pass), studied a little more, failed again with a 71. I was genuinely embarrassed.

What changed for third attempt: I stopped just rereading the NSPF manual and actually started doing timed CPO practice test questions every single day for three weeks. The repetition forced me to actually remember the chemical dosing calculations instead of just recognizing them on the page. Big difference between recognition and recall.

Also focused hard on the areas I kept missing — water balance (Langelier index especially), chlorine chemistry, and the health code stuff around fecal incident response. If anyone else is struggling, happy to share what study materials I used. Passed with an 82 on try three.