Hmmmm... Meh, in an interesting way. I give it 6/10.
A saintess aspiring to be a villainess is good drama.
Aspiring and failing to be a villainess can also be good comedy.
Aspiring to be a villainess, and accidentally ending up a shonen protagonist? Kinda odd.
I still find this story moderately interesting, because as I read it, I can clearly see the things the author could do to make this a good story. Like, the obvious first step is for her to list the qualities of a good villainess and do her best to emulate them individually. Proactive scheming, ruthless calculation, social climbing, acquiring minions, holding grudges, and so on.
There's a lot you can do with that setup. You can have her succeed individually but fail at the totality. You could have her fail at everything because her basic instincts contradict villainy. You can have her new goals and effort actually be good for her and develop a more nuanced personality.
Instead the MC suffers genre drift, blows through the entrance exam, joins the adventurers' guild, tramples the combat tester
and accidentally goes off to pick herbs in an S-ranked monster-infested environment.
Like, um, I've read this a hundred times already in the isekai genre? Do you think you're special?
Where's the villainess part? This is why authors oughtn't be allowed to name their works until they're at chapter 30...