This is called recapitulation before starting fresh chapter or topic

even in serial episodes on TV and films, a small recount of past episode/film sets things forward:

Reinforces learning.

Establishes continuity.

Activates prior knowledge.

Boosts confidence.

Identifies gaps.

Encourages active participation.

Improves retention over time.

Aligns learning objectives.

Normally I ask a few questions of past session to students selectively and give few points of past session. Same way in end tell in very brief what will be next session about so student can do home study and come prepared . These are every important at senior classes and professional courses like MBA

لأن الدروس تكون متسلسلة واذا راجعت السابق تجد الحل للدرس الجدي

I am an accounting instructor and we must cover 15 chapters in 15 weeks. In some classes, this rises up to 18 chapters. In some courses, there aren`t as many as 15 chapters but the coverage of each chapter may be huge. This does not allow me to go back and review what I have talked about in the previous sessions. Having said that, in almost every class, I say something that I taught before. Do students remember what I said before? Rarely they do, only a couple of them.

This is only important for short-term memory and for defining concepts. What is learned with understanding does not require repetition because it is stored in long-term memory.

Revising the previous lesson before starting a class has twofold benefits: to the lecturer and the student. To the lecturer, it provides in-depth knowledge and connections to another topic and is a consideration for students who could not attend the previous lecture. To the student, it increases understanding of the topic and can be used to predict the lecturer's area of interest for examination purposes.

تذكير بالموضوع السابق وربطه بالموضوع الحالي

One of the benefits of revising previous lesson is to remind the students what was taught to them, and this is because many students do not read after classes so they only read when exams timetable is out. So the revision will help refresh thier memory