One of the most unproductive form of exam stress. PASS usually occurs the day following an important exam and involves the sufferer analysing and stressing about said exam and all the things they think they got wrong or right, what they could have done better and how well they think they did.
It is usually accompanied by insomnia which usually leads to poor performance in exams that may follow, thus perpetuating further post and pre-exam stress.
person1- oh man, I'm gonna be up all night thinking about that physics paper we just wrote.
person2- yeah, I definitely got question 9.3.1 all wrong...
person1- damn it, Post-exam Analysis Stress Syndrome (PASS) is so pointless!