tosbase has some really outdated builds. Some even having skills that don’t exist anymore. Or even class circles that don’t exist anymore (like centurion)
The progression goes like this:
Rank 1 -> You pick Cleric 1
Rank 2 -> You can pick Cleric 2, Priest 1 or Krivis 1
Rank 3 -> You can pick Cleric 2 or 3, Priest 1 or 2, Krivis 1 or 2, Diev 1, Bokor 1
Rank 4 -> You can pick Cleric 2/3, Priest 1/2/3, Krivis 1/2/3, Diev 1/2, Bokor 1/2, Paladin 1, Sadhu 1
etc…
And of course, as an example you need too pick Priest 1 before you pick Priest 2. Or Cleric 2 before you pick Cleric 3.
To make it simpler for you, I recommend using the (updated) skill simulator:
PS. Some hidden classes have special requirements. To get Chaplain you need to be Priest 3 first. And hidden classes can only get one circle.
PS. When browsing tosbase builds, try to filter them by date so you don’t get super outdated builds.