(no title)

I would use tags ( or better a tags-treee) to insert a structure in existing or coming Lists of contents.

As Rob has written, but I would use "hidden" tags for the second level - with a starting underscore - like wt1 _topic1 , wt1 _topic2 and so on..
Such a list:

IELTS Writing Task 1

 [[module ListPages category="*" tags="+wt1" order="title" separate="no" ]] * **%%title_linked%%** [[/module]] 

IELTS Writing Task 2

 [[module ListPages category="*" tags="+wt2" order="title" separate="no" ]] * **%%title_linked%%** [[/module]] 

I am not sure if the bulllet list will work correct in the second ( or first ) level…