You can edit the Study Plan and specify whether or not you are allowing students access to the Writing Practice exercises. This property is on the Study Plan Properties page.
For Use the Writing Practice section of the Study Plan, select Yes to display the Writing Practice tab and exercises in the Study Plan.
If you also want to allow students to submit these exercises to you, select Yes for Allow students to also submit a draft to instructor.
Tip: You can also specify the number of exercise drafts students can submit for automated feedback by editing the exercise's properties.
See also:
Edit Study Plan Properties | Customize the Study Plan