<p>To directly answer the OPs question, I think the class rank is going to be somewhat meaningless at the new school. You have a class of apples that have has the same opportunities 9-12 and you compare them and make a calculation. If you throw an orange in the mix 3/4 of the way through you now have an apple/orange hybrid who clearly is not an apple. Any attempt to make a conversion of orange data to apple data for the preceding 3/4 is going to be sloppy science at best. Where that apple/orange hybrid falls in any calculation of the group of apples is going to be less meaningful as it’s only 1/4 apple. There is no way to know how big that hybrid would have grown if it had been an apple the entire time.</p>
<p>Okay, it made perfect sense to me. :)</p>