Have you taken the SAT or ACT? If not, I wouldn’t at this point.
What major are you looking to apply to?
For IU and Purdue, and the rest of the schools on your ultimate list, you need to make the EA deadlines, many of which are Nov 1…so get writing your common app essay, as well as any supplemental essays that are due.
What is your budget? I agree with many of the suggestions already made pending the budget/major info, I would add Iowa and Iowa State.