They don't affect the score at all. Experimental questions are exactly what their name says, "experimental." If you get them right, good for you. If you get them wrong, don't fret over it. The PCAT examiners use the experimental questions to judge what types of questions examinees (us) usually get right and wrong. However, we have no idea what questions are experimental, unlike past PCATs, where all of the passages were experimental 🙁
