Question

what are the objective of substitute activities conducted in the class

Answer 1

It's undoubtedly the toughest job in the teaching profession...coming into a situation in which you might not know the students who may see the absence of their teacher as a "day off". You're unfamiliar with the routines and behavior management procedures (if they exist), have no history with the students (and thus no positive relationship), and find that no plans have been left for your use. You don't know the other faculty members adjacent to your room, and sense little if any support from the school's administration. That's the worst case scenario, and I hope that you never experience it.

In a best case scenario, you've been hired as a "permanent sub", working everyday in the same school, "covering" for teachers who are absent for one period or several weeks. You are known and supported by the administration, faculty, and pupils.