Here are some ideas....

(1.) Just listen to session A, and treat session B like a bonus Paraliminal. So far, I have never gotten to the point where I listen to session B (with the exception of Sleep Deeply). As long as I am seeing benefits from listening to session A, I see no reason to move to session B.

(2.) Treat session A and session B as two different Paraliminals. Don't feel like you have to listen to session A first, if you feel ready to listen to session B.