The mysterious Thoom Ann GM recently released some statistics concerning how many exiles have passed the various circle tests.

Healers
1st circle: 17%
2nd circle: 19%
3rd circle: 25%
4th circle: 40%

Fighters
1st circle: 23%
2nd circle: 34%
3rd circle: 27%
4th circle: 10%
5th circle: 5%
6th circle: 1%

Mystics
apprentice: 62%
journeyman: 29%
full mystic: 9%