My café is paying for me to get SCA certified and I want to make sure I'm actually prepared before the assessment day. I've been making espresso for 2 years but I've never formally studied extraction theory or sensory evaluation.
I know the practical component involves pulling shots and calibrating a grinder but I don't know how precise the evaluators are about things like extraction percentage targets or TDS readings.
What level of coffee science knowledge does the exam actually expect?
Milk texture for cappuccino and latte is also assessed — microfoam consistency, pouring technique, and temperature range (55–65°C). Spend time on milk if your café does mostly drip, since you might not steam daily.
The SCA barista exam does test extraction theory — you need to know the target extraction yield range (18–22%) and TDS range for espresso (8–12%). They won't expect you to calculate it on the fly but you should know what the numbers mean and how grind and dose affect them.
Sensory vocabulary matters for the oral/written component. Learn the SCA flavor wheel terms and practice describing coffees using it. "It tastes fruity" isn't enough — "stone fruit acidity with a round body" is the kind of language they expect.
The practical calibration piece is really about demonstrating a systematic process. Evaluators watch whether you adjust one variable at a time, taste and evaluate, then adjust again. Random fiddling fails even if you end up at the right extraction.