To correct your mistakes and misconceptions: 1. Everyone except prisoners lives in society. Students live in society. So it does not make sense to imply or say that a person enters society only when he leaves school. A prisoner re-enters society when he leaves prison. 2. The pronoun for "a student" is he or she and not they. 3. We say "society" and not "the society". 4. We say "to describe a situation" and not "to express a situation". 5 . It is not clear what "situation" you wish to describe. Most students need a job when they leave school. Those who have found a job enter the workforce. Other than that, there is no "situation". What are you trying to say?

"After a student leaves school, they enter (mainstream) society" note: mainstream is a common adjective in this context also, do not say "the society" - that has a different meaning - like belonging to a club

After a student graduates, they enter society. After a student graduates, they join society. After a student graduates, they enter the workforce. After a student graduates, they join the workforce.

It is best you put this as a note entry since errors can be corrected easily. First of all, it is, "After studentS graduate, they enter society" or "after a student graduateS, he enters society". As Ben had pointed out, we all live in a society except for prisoners, the brain dead etc... It would be better to say, "After graduating, students enter the real world".

Hi