<p>One clarification: If you apply to Dartmouth ED, you cannot apply to MIT EA (or any other early program). </p>
<ol>
<li><p>You would need to check with the individual college websites for that. Most don’t prefer it, but they won’t mind it either.</p></li>
<li><p>The 730 in Math is rather weak (for Ivy). I say this because an 800 puts you in the 89th percentile. However, it will probably not hurt you (but it won’t help)</p></li>
<li><p>Yes, most colleges don’t mind score choice with Sat II scores. Again, check on the individual websites. I know MIT wants all scores and will choose the higest science and math for consideration.</p></li>
<li><p>They do ask for intended major. Also, your ECs and essays can refelct your interest in these fields. I’m not sure about all schools, but with MIT, the major you put will not affect your admission chances and it will not tie you down (you don’t need to choose right away).</p></li>
<li><p>Again, some schools take the ACT for both the SAT and Subject tests. But many ivies require either the ACT or the SAT AND the SAT IIs. Check on the admissions sites.</p></li>
</ol>
<p>I hope this helps!</p>