additional info part on commonapp???

<p>if I've moved around a lot and attended like 7 schools in 3 countries, where should I put that info? and do I mention I've been educated in very different school systems( Canadian , Singaporean, International, chinese local school...)?
and if I skipped the latter half of 9th grade and first part of 10th grade, do I explain that in the additional info part?
Thanks!!!</p>