I think many schools don't see the IR school but you should get 7-8. Once you practice, you can get to that score.
#1: Do the Questions Have the Same Format as Real GMAT IR Questions?
GMAT IR questions have unique formats that are unfamiliar for most students and can be confusing. The only way to ensure you know how to approach the questions on test day is to practice with questions that look like those you’ll see on the real GMAT IR section until you’re comfortable with with their style. As such, it’s vital that your GMAT IR practice questions are the same four types and closely resemble those you’ll see on the test.
#2: Is the Resource Computerized?
You’ll take the GMAT on a computer, so it makes sense to practice on a computer as much as possible before test day. This is especially important for IR practice, since the questions require you manipulate data and interact with answers in ways that aren’t possible on paper.
#3: Does the Difficulty Level of the Practice Questions Match the Real GMAT?
While the Integrated Reasoning section isn’t adaptive, you will see questions at different difficulty levels (easy, medium, and hard). When practicing, you’ll want to make sure that your GMAT IR practice questions cover all difficulty levels so you’re prepared to solve whatever questions you see on test day.
You should also beware that unofficial questions can sometimes be much easier or harder than the questions you’ll actually see on the GMAT. If you notice that you’re doing much better or worse than usual on a specific set of practice questions, consider that they may not be very accurate.
#4: Are Practice Questions Grouped by Skill or Difficulty Level?
Targeted practice, when you focus your practice session on one specific skill or question type, is one of the most effective ways to prepare for the GMAT. If you decide to focus on solving only graphic interpretation questions for one hour-long session, you’ll learn more than if you break that same one-hour session into shorter, 15-minute sections for all four question types. You might also want target your practice by difficulty level, for instance working at solving easy questions in a shorter amount of time.
Resources that allow you to sort questions by difficulty level or skill are extremely valuable, since they make creating targeted practice sets much simpler
Source - Prepscholars
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