Which adventure should I start in Pathfinder: Wrath of the Righteous Adventure Card Game?
Paizo has actually admitted that Wrath of the Righteous ended up a little harder than intended. In particular, the B scenarios are considered by some to be harder than the #1 scenarios.
Fortunately, this is addressed in the FAQ:

Resolution: Make one or both of these changes only if you're looking for an easier time with Wrath B scenarios:
On the B and C henchman Tangle Trap, add the line &quot;If defeated, you may immediately attempt to close the location this henchman came from.&quot;
Move some or all of the following cards from Set B and/or C to Set 1, and change their set indicators to 1: the barrier Arboreal Blight (B &amp; C), the monster Carrion Golem (B &amp; C), and 1 of the Demonic Horde barriers in B and/or the Demonic Horde barrier currently in C. Then move some or all of the following cards from Set 1 to Set B, and change their set indicators to B: the monster Accursed Priest and the barrier Poisoned Spiked Pit Trap.