The two previous reviews of IWHS are accurate. As a student, I love having access to a well-stocked library, multiple literary databases, and very modern science equipment.
You can make the most of these facilities if you are a disciplined student. If you have trouble staying on task, there are few teachers who will encourage you to fix it.
Furthermore, if you are struggling in your faith, you will have little incentive to improve. Students are far more likely to accept you if you have a skeptical attitude toward religion.
Go to IWHS if it's the right fit for you, but make sure you have encouragement--academically and spiritually--outside of school.