Learning Parts:  Instant Notes, Objective Types, Problems with Solutions, Questions with Answers, and Video Lectures.

Progress in Learning: You can mark complete (by clicking the tick) if you have ensured good learning of the corresponding topic.

Progress in Assessment: Getting a average grade of 60%in each of the Assess Yourself quizzes is considered as completion of this activity. 

You can read the activity / assess yourself any number of times.