You should take the following quizzes after you finish the corresponding lecture. For example, take quiz #1 after you complete reviewing the lecture notes and video for lecture 1.
Quiz 1 on Lecture 1: Epidemiology and Study Designs
Quiz 2 on Lecture 2: Systematic Reviews and Meta Analysis
Quiz 3 on Lecture 3: Guides to Medical Literature Appraisal 1
Quiz 4 on Lecture 4: Guides to Medical Literature Appraisal 2
Quiz 5 on Lecture 5: Health Surveillance: Risk Factors, Disease Burden & Indicators
Quiz 6 on Lecture 6: Applied Statistics 1
Quiz 7 on Lecture 7: Applied Statistics 2