Research

Most of the research on implementing quizzing in the classroom with positive results has focused on quizzes that are given after the lecture (for example, Lyle and Crawford, 2011). However, one might rightfully wonder whether it is best to give these end-of-class quizzes, or might it be more effective to intersperse quizzes throughout a class?

Recent research suggests that interspersing quiz questions throughout learning can reduce the interference that happens when we are trying to learn a lot of similar pieces of information in a row, such as long lists of words (Szpunar et al., 2008; Weinstein et al., 2014) or many face–name pairs (Weinstein et al., 2011). This research has also been applied to more educationally relevant information, such as video lectures (Szpunar et al., 2013).

The results suggest that interspersing quiz questions throughout learning can help with learning information presented later on in the class in comparison to not quizzing, because the quiz questions help relieve some of the interference that typically builds up during a longer learning session.

source - https://www.learningscientists.org/blog/2018/9/27-1