Because too many 1-star great teachers had registered for the 1-star great teacher examination, the amount of work needed and the difficulty of conducting the examination was too great. Hence, the Saint Gate decentralized their authority and allowed each province to conduct its own examination during March every year.
Naturally, the content of the examination was still decided by the Saint Gate. This was for the sake of fairness.
The Saint Gate ruled that the examinees could choose the province they wanted to take the examination in. This was to increase competitiveness because some geniuses loved competitions of skill with others of the same location.
Speaking of which, doing so was a little unfair because there would at most be 300 people who could pass for each province. If some geniuses went to a certain province, their presence would surely cause some of the examinees from that particular province to be squeezed out of the 300.