Give your team one standardized test before training and again after. Scoring is instant and automatic, so there is no manual marking, and you can put the two sets of scores side by side to see what changed.
You run product training for 40 people and leadership wants proof it landed. Build one test, run it before the training and again after, then compare the two score reports. Keep the same set of questions for both runs so you are measuring the same thing each time.