I am planning on applying to schools like U Michigan, Georgia Tech, Purdue, and UIUC for computer science. Currently, I have a 1490 SAT, M: 790, R: 700. If the schools offer test-optional should I apply for test-optional?
Your score is above Purdue's 75th percentile and is also above average at UMich, so I think you should submit them. Also, I'm pretty sure the GT requires the SAT.
Your score also falls into the middle 50th % for UIUC Engineering, so I think you should submit it.
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I think 1490 should be excellent, it's a very high test score. Don't think it will hurt your admissions chances, so I'd submit it. Good luck!