The course consists of:
5 units of Tutorials - Note there is no Unit 6
6 units of eBook (Extracts of relevant chapters from SCI's textbook)
Mock Quiz

Start with Chap 3, then go to Chap 1..Chap 2....

There is no Chap 6 as it is case studies.

You can access any of these units independently.
However, you are strongly encouraged to work in accordance to the sequence planned out.