Talesh's page

I think I put my question in the wrong forum.
http://paizo.com/threads/rzs2qbpl?Trixy-Witchy-Spells

Summary of the problem:
Is there a way/formula/chart to determine how many "known" spells a high level witch should start with? Coming into a game midway though at level 12.

I'm sure this has been beaten to death on the forums somewhere, so my apologies for redundancy. I just couldn't seem to find an answer.

I'm creating a new character joining the middle of a huge campaign. So at level 12, is there a good chart/formula for figuring how many spells (and of what levels) her familiar should have stored? Is there a sidebar I missed, or is this more of a GM call?

My other question is: Is there any feat or mechanic that allows a witch to switch spells out last minute, like a cleric? Or are they all set in stone for the day once communed?

Thanks!
Witchypoo-In-The-Making