<p>Would my chances of getting into an ivy league decrease if i did not do exceptionally good on SAT subject tests but still did great on SAT/ACT</p>
<p>That depends.</p>
<p>If you submit the SAT, then all IL schools require Subject tests.</p>
<p>If you submit the ACT, then some IL schools will require Subject tests and others will not.</p>
<p>If Subject tests are required, then one would assume they have some impact on decisions. How much impact? No one can know that except the Adcom that reads your file.</p>
<p>Note: in the future I’d recommend perhaps asking about selective colleges rather than IL, as that’s just an athletic conference, and there are plenty of other selective colleges in the country.</p>