You can access practice tests for the HESI exam through the test preparation database Peterson's. The link is here: https://infotrac.gale.com/itweb/lincclin_ircc?db=TERC
Once in the test prep database, create an account. This is a separate account from your Pioneer Portal and is used to save your progress on practice tests in the database. Once you are logged in, conduct a search for HESI.
Click on View all Results and scroll down until you see HESI. Click Add to My Resources and then next time you log in, you can access the HESI exams through My Resources.