@windstruck. There are two main tracks for entering the society.

The first is through the academy. There are entrance exams to demonstrate basic academic aptitude, then 5-8 ish years of studying and learning and if you complete your studies with a certain minimum grade you get invited to join the society if you want (not everyone does so, there are other positions available for graduates of the society's academy).

The second is for people with significant skills already. Those would have to pass an assessment consisting of interviews and a couple of tests of skill, generally involving completing selected commissions. Sponsorship by a member of the society can fasttrack the process, but is not necessary.

Sometimes someone outside the society displaying a great degree of skill could get invited in as well.